Season 1, Episode 1
City of Heroes
Barry discovers his powers and puts them to the test, only when he finds its no longer a test but the real thing when he encounters a certain someone.
Season 1, Episode 2
Fastest Man Alive
Barry escorts Iris to a university gathering honoring scientist Simon Stagg. When six gunmen storm the event, Barry changes into The Flash and tries to stop them. While he does save a man's life, he passes out before he can capture the robbers, which frustrates him. As Dr. Wells, Caitlin and Cisco scramble to find out what's wrong with Barry, Joe comes down hard on Barry for taking the law into his own hands and risking his life. Barry realizes that it wasn't six gunmen but a metahuman named Danton Black, who can make multiples of himself. Meanwhile, Iris becomes even more intrigued by the "red streak."
Season 1, Episode 3
Things You Can't Outrun
As Barry and the team at S.T.A.R. Labs work to capture Kyle Nimbus, a.k.a. The Mist, a dangerous new meta-human with toxic gas powers, they revisit the painful night the particle accelerator exploded and killed Caitlin’s fiancé, Ronnie. Meanwhile, Joe decides to finally visit Henry in jail after all these years, but things take a dangerous turn when Kyle shows up looking to punish Joe for arresting him years ago. Meanwhile, Iris and Eddie continue to hide their relationship from Joe.
Season 1, Episode 4
The Flash stops a robbery but the culprits get away after shooting a guard, and The Flash chooses to save the man instead of following the criminals. Joe shows Barry a book of suspects and Barry identifies Leonard Snart as the leader of the group. While investigating the case, Barry gets a surprise visit from an old friend - Felicity Smoak, who heard about his new abilities and came to check them out for herself. She joins him at S.T.A.R. Labs to help stop Snart after it's revealed that Snart his gotten his hands on a stolen "cold gun," which could kill The Flash. Dr. Wells is furious when he finds out that Cisco built the cold gun without telling anyone and now it's missing. Meanwhile, Iris is getting the silent treatment from Joe because of her relationship with Eddie. Finally, The Flash and Captain Cold have an epic confrontation.
Season 1, Episode 5
After a bomb goes off downtown, the army, led by General Eiling, rolls in and takes over the case, much to Joe's surprise. Suspicious, Joe tells Barry that he and his friends at S.T.A.R. Labs should look into the army's involvement. Wells informs the team that Eiling was experimenting on his men to turn them into super soldiers. Cisco confirms one of Eiling's soldiers, Bette Sans Souci, was at the bomb site. The Flash tracks her down and realizes that she's not setting off the bombs, she is a meta-human who can blow things up just by touching them. Meanwhile, when Joe learns Iris is writing about "the streak," he tells Barry to make her stop. Barry realizes Iris won't listen to him so he decides to have The Flash pay her a visit.
Season 1, Episode 6
The Flash Is Born
The Flash faces a new meta-human named Tony, who can turn himself into girded steel at will. While Dr. Wells and Caitlin are concerned about Barry's safety, Cisco comes up with a plan to take Tony down. Meanwhile, Iris's blog on The Flash gets her into trouble, and Eddie witnesses Tony's abilities firsthand and begins to ask questions that Joe doesn't want answered. Joe asks Dr. Wells to help him solve Nora Allen's murder.
Season 1, Episode 7
The Flash goes up against Farooq aka Blackout, a metahuman who can harness electricity. During their battle, Farooq zaps The Flash and siphons all his electricity, leaving The Flash without his speed. Dr. Wells, Caitlin and Cisco work to reverse the effects on Barry, but their efforts are disrupted when Farooq comes banging on S.T.A.R. Labs doors in search of Wells, who he blames for his accident. Without Barry's powers to protect them, the group must figure out a way to save themselves from the metahuman. Meanwhile, Tockman manages a coup inside the Central City police department and takes several people hostage, including Joe and Iris. While Iris is sure The Flash will save them, Eddie has a trick up his sleeve.
Season 1, Episode 8
Flash vs. Arrow
Barry is thrilled when Oliver, Felicity and Diggle come to Central City to investigate a case involving a deadly boomerang. Excited about teaming up with his friend, Barry asks Oliver if he'd like to help him stop Ray Bivolo, the meta-human Barry is currently tracking. Bivolo causes people to lose control of their emotions and has been using that skill to rob banks. Unfortunately, the superhero partnership doesn't go as smoothly as Barry expected. When Oliver tells Barry he still has a lot to learn, Barry sets out to prove him wrong by attempting to stop Bivolo alone. However, when Bivolo infects Barry and sets him on a rage rampage, everyone is in danger, and the only one who can stop him is the Arrow. Meanwhile, Iris is furious when Eddie tries to get a task force to stop The Flash, Joe and Dr. Wells agree the Arrow is a bad influence on Barry, and Caitlin and Cisco deal with a new team in S.T.A.R. Labs.
Season 1, Episode 9
The Man in the Yellow Suit
Barry finds himself face-to-face with his nemesis, the man in the yellow suit, a.k.a. Reverse Flash, who killed his mother. Barry is frustrated when the Reverse Flash escapes, but Dr. Wells and Cisco come up with a plan to trap him. All they need is bait, so they turn to Dr. Tina McGee from Mercury Labs to help. Meanwhile, it's Christmas at The West household and Iris is in full holiday cheer. Eddie gives her a surprising gift but also leaves her with a question that could change her life. Joe joins the search for the man in yellow and ends up in the crossfire.
Season 1, Episode 10
Revenge of the Rogues
Leonard Snart AKA Captain Cold returns to Central City with a new hotheaded partner in tow - Mick Rory AKA Heat Wave. The duo plan to steal a multi-million dollar painting, but Cold has another agenda while in town - to set a trap for The Flash. Snart and Mick kidnap someone close to The Flash and threaten to kill them unless The Flash shows up for a battle of fire and ice. Barry tells Joe he isn't sure he should take on Snart again after the casualties that happened the last time they fought. Meanwhile, Barry asks Dr. Wells, Caitlin and Cisco to help him double his training efforts so he's ready for the Reverse Flash when he returns to Central City. Iris deals with the aftermath of Barry's confession, and Cisco makes the CCPD a new shield.
Season 1, Episode 11
The Sound and the Fury
Dr. Wells' former protégée, Hartley Rathaway, returns to seek revenge on his mentor after being affected by the particle accelerator explosion. Now able to manipulate sound waves, the brilliant Rathaway is a dangerous threat to both Wells and The Flash. Meanwhile, Iris is thrilled when she's hired by the Central City Picture News as their newest cub reporter. Unfortunately, her editor pairs her with a veteran reporter, Mason Bridge, who wants nothing to do with her. Cisco recalls his first day on the job at S.T.A.R. Labs when he met Hartley and Caitlin. Joe asks Eddie for a favor but asks him to keep it a secret from Barry.
Season 1, Episode 12
Crazy for You
Caitlin decides that she and Barry need to move on from Ronnie and Iris and find new loves so she takes him for a night out at the local karaoke bar. Caitlin doesn't have any luck making a love connection but Barry meets Linda Park, a sports reporter for the Central City Picture News, and asks her out on a date. When Barry tells Iris he has a date, Iris is surprised by her reaction. Meanwhile, Cisco considers Hartley's dangerous offer and the team searches for Shawna, a meta-human with teleportation powers, who just busted her boyfriend Clay out of Iron Heights. When Henry snoops around in an attempt to help Joe and Barry solve the crime, he ends up in the infirmary after getting roughed up by inmates.
Season 1, Episode 13
The Nuclear Man
After Ronnie attacks a physicist, Barry and the team realize they need to go after Caitlin's fiancé who is now a dangerous meta-human. They deduce the best way to track Ronnie is to find Dr. Martin Stein who was working on a project called F.I.R.E.S.T.O.R.M. Barry struggles to balance his duties as The Flash and his relationship with Linda Park, and Joe enlists Cisco's help to reinvestigate the murder of Nora Allen. General Eiling returns to Central City.
Season 1, Episode 14
After the nuclear explosion separates Ronnie and Dr. Stein, Barry and the team believe both men are safe. Caitlin is thrilled to have her fiancé back and prepares to resume their life together while Dr. Stein returns to his wife. However, when General Eiling targets Firestorm, Ronnie and Dr. Stein must decide if they are safer together or apart. Meanwhile, Mason Bridge tells Iris that there is something secretive going on at S.T.A.R. Labs and Dr. Stein gives Barry some important information about time travel.
Season 1, Episode 15
Out of Time
Mark Mardon aka The Weather Wizard appears in Central City intent on avenging his brother Clyde's death, and sets his sights on Joe, who shot Clyde. When Mardon attacks Joe and Barry, Barry is able to super-speed them to safety but Mardon gets away. Barry warns Joe not to go after a meta-human alone but Joe doesn't listen and ends up in grave danger. Meanwhile, Cisco looks into the night the team captured the Reverse Flash and realizes something doesn't add up and begins to wonder whether Joe was right about Dr. Wells. Barry and Linda end up on an awkward double date with Eddie and Iris.
Season 1, Episode 16
The Flash learns that Captain Cold and Heat Wave have returned to Central City. This time Snart has brought along his baby sister Lisa to help wreak havoc on the city.
Season 1, Episode 17
Copycat killer who goes by the name "The Trickster" starts setting off bombs in Central City. In order to stop the villain, Barry and Joe meet with the original Trickster, a criminal mastermind named James Jesse, who has been imprisoned for 20 years. Things quickly go from bad to worse when the Tricksters unite and take Henry prisoner. Meanwhile, Iris asks Eddie for help with a case, and flashbacks show how Harrison Wells came up with the idea for the particle accelerator.
Season 1, Episode 18
All Star Team Up
Barry is surprised when Felicity Smoak arrives from Starling City along with her boyfriend, Ray Palmer, who flies in as the Atom. They've come to visit S.T.A.R. Labs as Ray needs help with his suit. Their timing turns out to be fortuitous because it's all hands on deck after a meta human named Brie Larvan unleashes hundreds of robotic bees to attack and kill her former co-workers, including Dr. Tina McGee. A group dinner with Barry, Felicity, Ray, Iris and Eddie turns into a disaster.
Season 1, Episode 19
Who Is Harrison Wells?
Joe and Cisco head to Starling City to continue their investigation of Dr. Wells. While in town, the duo enlists the help of Captain Lance, and Cisco meets the Black Canary, who asks him for a favor. Meanwhile, back in Central City, Barry races to catch a meta-human named Hannibal Bates who can transform himself into every person he touches - which includes Eddie, Iris, Caitlin and even The Flash.
Season 1, Episode 20
Barry, Caitlin, Cisco and Joe set a trap for Wells. Cisco uses himself as prey which puts him in grave danger. Meanwhile, Eddie makes a decision regarding Iris, which leaves Joe a bit unsettled.
Season 1, Episode 21
Barry must deal with the Reverse Flash's latest threat to a member of the group. To make matter worse, Dr. Wells unleashes Grodd on the city in order to distract Barry and the team. Joe, Barry and Cisco head down into the sewers to catch Grodd but the gorilla quickly gets the upper hand after he kidnaps Joe. Iris and Barry have a heart to heart talk.
Season 1, Episode 22
As Wells once again gets the upper hand on the S.T.A.R. Labs team, Barry realizes he needs to make a big move and reaches out to an old foe, Captain Cold, for help. Joe and Caitlin warn Barry that Cold can't be trusted. True to form, Cold has his own agenda that involves the meta-humans trapped in the containment cells. As things seem to be going from bad to worse, The Flash gets reinforcements - Arrow and Firestorm.
Season 1, Episode 23
Harrison presents Barry with an impossible choice: save Nora and create an alternate timeline, while letting Harrison escape. or let his mother die as she did in the original timeline.
Season 2, Episode 1
The Man Who Saved Central City
Six months after the Flash and his friends stop the Singularity, Central City holds a rally in the speedster's honor. However, Barry doesn't want to go given the sacrifice that was made by the true hero. Meanwhile, a new metahuman, Atom Smasher, sets out to kill the Flash.
Season 2, Episode 2
Flash of Two Worlds
The team's visitor, Jay Garrick, explains that he comes from a parallel world and was a speedster there, but lost his powers transitioning over. Now he insists that Barry needs his help fighting a new metahuman, Sand Demon, who came from Jay's world. Meanwhile, Officer Patty Spivot tries to join Joe's Metahuman Taskforce.
Season 2, Episode 3
Family of Rogues
Lisa Snart, aka Golden Glider, comes to the team for help when her brother Captain Cold is kidnapped. However, the Flash soon discovers that the villain is working for his father Lewis, who has some mysterious hold over him. Meanwhile, Caitlin and Jay work together to build a speed cannon so that Jay can return to Earth-2, and Joe tells Iris the truth about her mother.
Season 2, Episode 4
The Fury of Firestorm
Martin begins to destabilize without Ronnie to merge with him, and the team desperately seek out another metahuman with similar abilities. They find two men: Henry Hewitt and Jefferson "Jax" Jackson. Meanwhile, Iris does some digging into Francine's past, and Barry is hesitant to become involved with Patty after what happened between him and Iris.
Season 2, Episode 5
The Darkness and the Light
Barry battles another breacher, Doctor Light... and discovers that she's Linda's evil counterpart. Meanwhile, the team deals with a new Harrison Wells in their midst, and Barry asks Patty out on a date.
Season 2, Episode 6
After Dr. Light escapes from her pipeline cell, Barry asks Linda to help them lure Zoom to their world. Meanwhile, the team questions Harrison's motives and Cisco tries to use his powers on the Earth-2 visitor.
Season 2, Episode 7
While Harrison tells the team that he's heading back to Earth 2 now that they've failed to stop Zoom, Grodd launches a new series of attacks in an attempt to gain the chemicals that he needs to augment his intelligence. Meanwhile, Barry deals with his loss of self-confidence after Zoom cripples him, and Iris calls in a familiar face to help.
Season 2, Episode 8
Legends of Today. Part 1
Barry and Cisco take Kendra to Oliver and his team, looking for protection when a mysterious immortal comes seeking Kendra. However, a figure from her past arrives to tell her the truth. Meanwhile, Jay refuses to help Harrison test his new speed-enhancement serum, Velocity-6.
Season 2, Episode 9
Running to Stand Still
Weather Wizard frees Captain Cold and Trickster from prison to help him get revenge on the Flash, but Cold has second thoughts. Meanwhile, iris tells Joe about the son he never knew he had, and Patty confronts the man who killed her father.
Season 2, Episode 10
The Flash and his friends go up against a new meta-human, the Turtle. Meanwhile, Caitlin discovers the source of Jay's problems, and Patty questions whether she and Barry can have a relationship.
Season 2, Episode 11
The Reverse-Flash Returns
Eobard Thawne--Reverse-Flash--kidnaps Dr. McGee and forces her to find a way to send him back to his own time. Flash and his friends discover that Reverse-Flash is from a timeline before he killed Barry's mother, and realize that they may have no choice but to send him back. Meanwhile, Harry and Cisco work to stabilize Cisco's vibe power, and Caitlin desperately tries to find a cure for Jay's illness.
Season 2, Episode 12
While Flash takes on a new meta, dubbed Tar Pit, Barry offers to help Harry come up with a way to seal the breaches. He's unaware that Harry has secretly siphoned off some of Barry's speed... and plans to remove the rest.
Season 2, Episode 13
Welcome to Earth-2
Barry and Cisco travel to Earth-2 with Harry to rescue his daughter, and discover a strange world where friends are enemies and enemies are even worse. Meanwhile, Caitlin help Jay regain his speed so that he can deal with a new metahuman menace, Geomancer.
Season 2, Episode 14
Escape from Earth-2
While Cisco and Harry go looking for a captive Barry, Barry makes contact with the masked prisoner and learns that he is connected with Jay. Meanwhile, On Earth-1, Caitlin perfects Velocity-9 so that Jay can go up against Geomancer before he brings Central City down.
Season 2, Episode 15
King Shark escapes from ARGUS captivity and makes his way to Central City to kill the Flash. However, the hero and his friends are preoccupied with the recent death of one of their own. Meanwhile, Wally resents Barry's presence in his family.
Season 2, Episode 16
A new speedster arrives in Central City and spreads chaos wherever she goes. Flash takes the blame, and Iris' editor plans to write an expose on the hero. Meanwhile, Jesse discovers how far her father will go to protect her.
Season 2, Episode 17
When Barry reaches a dead end in going faster, he decides to travel into the past and trick Eobard Thawne--posing as Harrison Wells--into showing him how to go faster. However, something, in the timestream follows Barry back... and it's not friendly.
Season 2, Episode 18
With Harry's help, Barry becomes fast enough to stop Zoom. Using Vibe's powers, the team contacts Zoom on the other Earth and use his past to trap him. But Zoom manages to escape their trap and takes one of them hostage to force Barry to give up his speed.
Season 2, Episode 19
Back to Normal
Barry tries to cope with a life without superspeed, but finds himself forced to don the Flash suit when a metahuman abducts Harry believing that he's Harrison Wells. Meanwhile, Wally asks Joe to arrange a meeting for him with Flash, and Caitlin tries to escape her captivity.
Season 2, Episode 20
Zoom begins his reign of terror, unleashing the Earth Two version of Cisco's brother Dante on the populace. Meanwhile, Barry debates whether to undergo the dangerous process Harry has created to give him back his speed.
Season 2, Episode 21
The Runaway Dinosaur
While Barry is trapped in the Speed Force, his friends desperately try to bring him home... only to discover that he may not want to leave. Meanwhile, the particle experiment reanimates one of the team's old foes, who is obsessed with finding Iris.
Season 2, Episode 22
The Earth Two metahumans attack Central City en masse, and Barry is oddly confident that the team can handle them. Meanwhile, Cisco has vibes of an ominous future, and meets the Earth Two counterpart of a woman he loved.
Season 2, Episode 23
The Race of His Life
The team discovers what Zoom is up to, and why he wants Barry to race him. When they realize that Barry is out of control after the death of someone close to him, they lock Barry up for his own safety rather than let him participate in a race he can't win.
Season 3, Episode 1
After preventing his mother's death and altering history, Barry has a perfect life in the resulting timeline. But memory losses suggest that the danger isn't yet over.
Season 3, Episode 2
Barry discovers that he didn't restore the timeline as it originally was, and tries to reconcile the difference. Meanwhile, the Edward Clariss of the new timeline teams up with a new villain to bring Flash down.
Season 3, Episode 3
A new metahuman, Magenta, unleashes a magnetic wave of terror on the city. Meanwhile, Harry and Jesse come over from Earth-2 and reveal that Jesse now has superspeed... and Wally wonders if he gained the same power.
Season 3, Episode 4
The New Rogues
Taking the name of Jesse Quick and donning a mask, Jesse offers to help Barry against two metas, Mirror Master and Top. However, her inexperience puts her in danger and gets Flash trapped in a mirror. Meanwhile, Harry, Cisco, and Caitlin search the other Earths for a replacement for a Harry.
Season 3, Episode 5
A monster appears in downtown Central City and Julian vows to find the person responsible. While Flash tries to deal with the creature, Cisco tries to deal with his new teammate H.R. and realizes that he's hiding something.
Season 3, Episode 6
While Barry tries to deal with a new metahuman, Shade, Alchemy tries to convince Wally to join him and gain the powers that he had in Flashpoint.
Season 3, Episode 7
Flash discovers that he's powerless against Savitar's superior speed, but other matters take precedence when Caitlin turns into Killer Frost and goes on a rampage trying to find Alchemy.
Season 3, Episode 8
The alien Dominators land on Earth, and Barry realizes that he can't fight them alone. He summons Green Arrow and his teammates, and then the Legends, and then Supergirl from her Earth. However, the discovery of future-Barry's message forces Barry to reveal that he may have altered all of their lives when he changed the timeline, sowing the seeds of mistrust.
Season 3, Episode 9
As Christmas arrives, the team discovers Alchemy's identity. Jay travels from Earth 3 to lend the team a hand against Savitar, while Joe forbids Wally from helping.
Season 3, Episode 10
Borrowing Problems from the Future
Barry finally tells Iris and the others--except Joe--what he saw in the future and together they set out to stop that future from coming to pass. Meanwhile, Caitlin invites Julian to join Team Flash, and H.R. prepares to open the museum.
Season 3, Episode 11
Dead or Alive
A "collector" from Earth-19 arrives to take H.R. to pay with his life for traveling between dimensions. While Cisco challenges her to a trial by combat, Iris sets out to make her mark on the world before the future that Barry saw comes to pass.
Season 3, Episode 12
A new metahuman, Clive Yorkin, goes after the alternates of the people that wronged him in Flashpoint by turning them into ash. Meanwhile, Iris and Barry finally tell Joe about what Barry saw in the future.
Season 3, Episode 13
Attack on Gorilla City
Barry, Cisco, Caitlin, and Julian travel to Gorilla City on Earth 2 to rescue Harrison. However, they are soon captured and Barry is forced to fight a battle to the death against the gorillas' ruler, Solovar.
Season 3, Episode 14
Attack on Central City
Barry considers killing Grodd to stop him, but Harry convinces him that there's always another way. Meanwhile, Jesse tells her father that she's staying on Earth-1 and is surprised at his reaction.
Season 3, Episode 15
The Wrath of Savitar
The team is forced to use Julian as a conduit to Savitar to question the God of Speed. Meanwhile, Wally is haunted by visions of Savitar that slowly become more real.
Season 3, Episode 16
Into the Speed Force
Barry enters the Speed Force to rescue Wally, and meets some familiar faces. Meanwhile, Jesse ignores H.R.'s advice and sets out to find and defeat Savitar on her own.
Season 3, Episode 17
When Mon-El and Hank bring Kara to Earth-1 to ask Team Flash for help, Music Meister puts Barry under his spell as well and traps him and Kara in a musical where they have to finish the story to escape... and if they die in the musical then they die in real life as well. This story line started at the end of Supergirl: "Star-Crossed", Season 2, Episode 16.
Season 3, Episode 18
A new villain, Abra Kadabra, seeking out high-tech items. When Flash captures him, Abra offers the speedster Savitar's name if Flash lets him go. Meanwhile, Julian is forced to operate on a badly injured Caitlin.
Season 3, Episode 19
The Once and Future Flash
Barry travels to 2024 to discover who Savitar is and use the information to save Iris. However, he soon discovers that Team Flash was destroyed when Iris was killed... and Barry is responsible. Meanwhile, Killer Frost finds someone who can give her what she wants.
Season 3, Episode 20
I Know Who You Are
The team finds Tracy Brand, the woman that Future-Barry said would be able to imprison Savitar four years in the future. However, Savitar intends to kill Tracy and is using Killer Frost to do so. Meanwhile, Cecile tells Joe that she loves him and he freezes up.
Season 3, Episode 21
Cause and Effect
Cisco comes up with a plan to stop Savitar involving preventing Barry from forming short-term memories. However, the plan doesn't go as intended. Meanwhile, Killer Frost returns to S.T.A.R. Labs to help the team.
Season 3, Episode 22
With 24 hours left to save Iris, Barry recruits Len Snart from the past to steal a Dominator power cell from ARGUS. Meanwhile, Joe and Kid Flash take Iris somewhere that Savitar can't find her, and Killer Frost calls Vibe out to kill him... and the last vestiges of her old self.
Season 3, Episode 23
Savitar kills one of the team, and then comes up with a new plan to become a god… and Barry must come up with a way to stop him.
Season 4, Episode 1
The Flash Reborn
Cisco comes up with a way to bring Barry back from the Speed Force when a new villain challenges Flash to a fight. However, Barry is... different than when he went in.
Season 4, Episode 2
Barry and Iris discover that they're having communication issues and go in for couples therapy... just as a new meta starts targeting tech billionaires. Meanwhile, Cisco inadvertently blows off a special day for Gypsy.
Season 4, Episode 3
Luck Be a Lady
The team goes up against the second of the Thinker's metas: Becky Sharpe, aka Hazard, who can gain good luck for herself as long as everyone else suffers. Meanwhile, Cecile suggests to Joe that they buy a new house, and Iris tries to plan the wedding.
Season 4, Episode 4
Elongated Journey Into Night
While looking for the bus passengers, Barry and Joe come across Ralph Dibny, a former cop who was fired from the force and gained a.... unique power from the dark matter. Meanwhile, Gypsy's father Breacher comes to see his daughter's new boyfriend Cisco, and soon starts hunting him.
Season 4, Episode 5
Girls Night Out
The guys and girls throw separate parties for Barry and Iris. While Barry gets drunk with some help from Cisco and Ralph takes them to a strip club, the ladies get involved with Killer Frost when her former boss, Amunet, demands that Killer Frost return to work for her.
Season 4, Episode 6
When Harry Met Harry…
Flash and Elongated Man team up to fight one of the Thinker's metas, a Sioux Indian woman calling herself Black Bison that is hunting down the three pieces of an artifact. Meanwhile, Harry calls together three of his counterparts to form the "Council of Wells" and figure out who DeVoe is.
Season 4, Episode 7
Therefore I Am
Barry risks his career and his team trying to confirm that Clifford DeVoe is their unseen adversary. Meanwhile, the origin of the Thinker is revealed.
Season 4, Episode 8
Crisis on Earth-X, Part 3
While Flash, Arrow, White Canary, Firestorm, and Alex attempt to return to Earth-1, Felicity and Iris team up to free Kara before Eobard and Fuehrer Queen remove her heart and transplant it into Overgirl.
Season 4, Episode 9
Iris has to choose between her husband and her friend when Amunet abducts Caitlin while Thinker captures Flash. Meanwhile, Caitlin meets a new metahuman, and Thinker unveils the next stage of his plan.
Season 4, Episode 10
The Trial of the Flash
While Barry stands trial for Clifford's murder, a new meta threatens Central City and only Flash can stop him.
Season 4, Episode 11
The Elongated Knight Rises
While Barry sits in prison, Ralph faces his first major supervillain and is injured for the first time. He has second thoughts about being a hero, and turns to Barry for advice.
Season 4, Episode 12
Honey, I Shrunk Team Flash
The team goes after a meta with the power to shrink people and objects... and Cisco and Ralph ended up reduced to two inch height. Meanwhile, Barry tries to give Big Sir hope that they can clear his name.
Season 4, Episode 13
When Wolfe offers Barry and the bus metas to Blacksmith, Barry engineers an escape for all of them. Meanwhile, Ralph has a crisis of faith when an old "friend" tells him that he eventually fails everyone who counts on him.
Season 4, Episode 14
The team discovers the identity of the ninth bus meta, but she doesn't want their protection. Meanwhile, Cecile turns to Harry for help when Joe's dreams keep her awake at night.
Season 4, Episode 15
A terrorist detonates a nuclear bomb, and Flash must race between microseconds to try and stop it. Jesse and Jay lend their speed to his efforts, but even the three of them aren't fast enough to stop a nuclear explosion that has already happened.
Season 4, Episode 16
Run, Iris, Run
Iris accidentally takes Barry's speed when a new meta with the power to swap powers touches both of them. Now they have to learn how the other half lives as Iris takes to the field and Barry monitors events. Meanwhile, Ralph refuses to leave S.T.A.R. Labs for fear that Clifford will kill him, and Harry undertakes a dangerous experiment to match their opponent's augmented intellect.
Season 4, Episode 17
Null and Annoyed
The Mechanic discovers what Thinker has been doing to her, and Breacher comes asking Cisco for help. Meanwhile, Team Flash goes after Subject 11, who can control gravity, and Barry questions if Ralph takes anything seriously.
Season 4, Episode 18
Team Flash tracks down the last bus meta, Edwin Guass, and discover that he holds the key to defeating Thinker. Meanwhile, Ralph considers taking extreme measures against Thinker,
Season 4, Episode 19
While Harry discovers the results of the Thinking Cap overload on his mind, the rest of the team call on a former ally to help them transport Fallout away from Thinker.
Season 4, Episode 20
Therefore She Is
Thinker continues with his "Enlightenment", and Gypsy joins Team Flash to try and stop him... and to discuss her relationship with Cisco.
Season 4, Episode 21
Harry and the Harrisons
When they need an organic weapon to use against Thinker, Team Flash turns to Amunet... but Caitlin has an ulterior motive. Meanwhile, Cisco forms a "Council of Harrisons" after the Council of Wells kicks Harry out of the group.
Season 4, Episode 22
Thinker gathers the final component in his master plan, and to stop him Barry must train Cisco and Caitlin how to function in Flash Time. However, he refuses to endanger more of his friends. Meanwhile, Harry has an idea as to where they can find Marlize, and Cecile's pregnancy has strange side effects on her telepathy.
Season 4, Episode 23
We Are the Flash
With Marlize's help, Barry tries to make a last-ditch attempt to reach the good DeVoe inside of the Thinker... and meets an old friend.
Season 5, Episode 1
After Nora meets her parents and reveals that she's stuck in 2018, Flash goes off after a new meta--Gridlock--and subsequently discovers what happens to himself in the future.
Season 5, Episode 2
The team take on a new meta with the ability to create blocks out of concentrated air. Meanwhile, Danielle realizes that she's losing her powers, Barry tries to deal with an overeager Nora, Cisco deals with the loss of Gypsy, and Caitlin wonders whether to track down her father.
Season 5, Episode 3
The Death of Vibe
While Caitlin and Ralph look into Thomas Snow's death, the others deal with Cicada and bring in a consulting detective to help them.
Season 5, Episode 4
Nora reveals what Iris did to her in the future that causes her to be so hostile to her in the present. Ralph and Sherloque try to trace Cicada, and Team Flash faces someone with the ability to control minds.
Season 5, Episode 5
All Doll'd Up
A new meta launches an attack on Central City, and Flash tries to deal with him while Nora avoids Iris. Meanwhile, Cisco, Caitlin, Sherloque, and Ralph try to track down Caitlin's father Thomas.
Season 5, Episode 6
The Icicle Cometh
Caitlin is reunited with her long-lost father, but Cisco suspects that not everything is at it seems. Ralph teams up with Cecile to learn who was injured the night of the Enlightenment by the satellite crash, and Iris, Nora, and Sherloque try to track down the core piece of the satellite.
Season 5, Episode 7
O Come, All Ye Thankful
A new weather-wielding villain appears in Central City, and demands that Team Flash hands Mark Mardon over to her. Nora reveals her unresolved feelings for losing Barry in the future, and the origin of Cicada is revealed.
Season 5, Episode 8
What's Past Is Prologue
To defeat Cicada, Nora comes up with a plan to assemble the necessary components from discarded villain items in the past and hide them in the present. Barry travels back in time to recover the three components, and reluctantly takes Nora with him.
Season 5, Episode 9
Elseworlds, Part 1
Oliver and Barry discover that they've swapped bodies. To find someone who can recognize them for who they are, they travel to Earth-38 to get Kara's help. Before they can solve the mystery of the mind-swap, the heroes have to take down a new menace: AMAZO, a robot with all of their powers.
Season 5, Episode 10
The Flash & The Furious
When a new meta-tech villain--Silver Ghost--helps Jocelyn Jackam escape, Nora wonders if Jocelyn wants to reform as she claims. Meanwhile, Barry is forced to stay in the pipeline after a confrontation with Silver Ghost, and Cisco discovers a possible meta-human cure.
Season 5, Episode 11
Cicada renews his murder spree against metas and cripples XS, causing Flash to lose control. Meanwhile, Killer Frost worries that she'll be destroyed by the cure Caitlin is working on, and Sherloque continues trying to unravel the mystery behind Nora's journal.
Season 5, Episode 12
Sherloque uses a memory machine to try and revive Grace, and Nora ends up trapped in the girl's memories. Barry and Iris go in to save their daughter, and see her memories of a future Iris. Meanwhile, Ralph tricks Cisco into a night out.
Season 5, Episode 13
To find a device that will let them administer the meta cure to Cicada, Barry and Ralph go undercover to get it from a black market arms dealer. Meanwhile, Iris decides to go looking for Cicada on her own, and Sherloque meets a woman after his own heart.
Season 5, Episode 14
Cause and XS
With Barry out of contact in the Speed Force, XS witnesses Cicada kill Killer Frost and tries to travel back in time to stop the outcome... and a different teammate dies with her every attempt.
Season 5, Episode 15
King Shark vs. Gorilla Grodd
The team need a meta to test the cure on, and settle on King Shark. Grodd escapes from ARGUS captivity and initiates his own plan to rule Central City... and then the world.
Season 5, Episode 16
Failure Is an Orphan
Barry tries to find the words to convince Cicada to take the cure that Team Flash has developed. Joe and Cecile join forces to question Ambres, and Eobard warns Nora that a new timeline is coming.
Season 5, Episode 17
Team Flash discovers the nature of the new Cicada when they find a time sphere that is a future duplicate of Eobard's. They also find out that Cicada II is going after the meta that she believes killed her parents, while Sherloque reaches the conclusion of his investigation.
Season 5, Episode 18
To learn why Nora joined forces with Eobard, Team Flash reads her journal. They discover that in 2049, Eobard was the only person who was honest with Nora, and taught her how to use her powers.
Season 5, Episode 19
Iris and Ralph travel to the future to find Nora and confront Eobard, while Barry, Joe, and Sherloque deal with Icicle's newest scheme.
Season 5, Episode 20
Back from the future, Nora gathers a group of Rogues to steal meta-tech. Meanwhile, Cicada II steals Cisco's metahuman cure, and Barry considers whether he's a good parent.
Season 5, Episode 21
The Girl with the Red Lightning
Cicada II assembles the part to build an atomizer that will release the meta-human killing virus, and Nora tries to use her psychic connection to the villain to find out what she's going to do next despite the risk.
Season 5, Episode 22
Barry must choose between stopping Cicada or releasing Eobard. Nora and Cisco make choices of their own as they face the crisis upon them.
Season 6, Episode 1
Into the Void
Team Flash face multiple Godspeeds, but focus on their personal issues: Barry and Iris are grieving over losing Nora, Caitlin is unable to summon Killer Frost, and Cisco deals with being Vibe no longer. However, they're forced to set aside their concerns when a black hole appears at seemingly random locations across Central City, threatening to destroy the metropolis.
Season 6, Episode 2
A Flash of the Lightning
Barry travels to Earth-3 to find a way to see the future where the Monitor claims he dies. Meanwhile, Cecile is torn between her powers and her career when she uses her empathic powers to discover that a young metahuman is innocent of murder.
Season 6, Episode 3
Dead Man Running
Barry recruits Ramsey to help him stop a mutated Mitch, but Frost doesn't trust the doctor. Ralph's mother Debbie is accused of murder, and another Harrison arrives on Earth-1.
Season 6, Episode 4
There Will Be Blood
Nash comes to Barry and Cisco and ask them to build something for him in return for his getting them something they want. Meanwhile, Ralph stops investigating the Dearbon case, and Ramsey gains the key to curing his HLH.
Season 6, Episode 5
Kiss Kiss Breach Breach
While Barry and Iris take a vacation, Cisco is suspected of killing Gypsy and her father comes looking for revenge.
Season 6, Episode 6
License to Elongate
Barry turns his attention to prepping Elongated Man for life after Crisis and without The Flash, but Ralph ultimately teaches Barry a lesson. Meanwhile, Cecile faces her own moment of self-discovery while helping a recuperated Chester P. Runk reclaim his identity.
Season 6, Episode 7
The Last Temptation of Barry Allen, Pt. 1
As Barry Allen stands on the threshold of his impending death in Crisis, his convictions are tested when the monstrous Dr. Ramsey Rosso infects The Flash with a mysterious, hallucinogenic contagion. Meanwhile, reporter Iris West-Allen uncovers a vast conspiracy.
Season 6, Episode 8
The Last Temptation of Barry Allen, Pt. 2
With The Flash freshly infected by the monstrous Bloodwork, Iris and Cisco battle to help Barry take control of himself before he's lost forever to Ramsey's influence. Meanwhile, the rest of Team Flash fight to reclaim control of Central City from Bloodwork's growing army.
Season 6, Episode 9
Crisis on Infinite Earths: Hour Three