The Flash

In the series premiere, Central City forensic scientist Barry Allen (GRANT GUSTIN) is accidentally given the power of super speed in a freak particle accelerator accident.

Barry escorts Iris to a university gathering honoring scientist Simon Stagg (guest star WILLIAM SADLER). 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 (guest star MICHAEL CHRISTOPHER SMITH), who can make multiples of himself. Meanwhile, Iris becomes even more intrigued by the “red streak.”

As Barry and the team at S.T.A.R. Labs work to capture Kyle Nimbus (guest star ANTHONY CARRIGAN), 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 Raymond (recurring guest star ROBBIE AMELL). 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.

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 (guest star WENTWORTH MILLER) as the leader of the group. Snart revises his plan to steal the Kahndaq Dynasty Diamond and gets a boost when he gets 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 (aka Snart) have an epic confrontation.

After a bomb goes off downtown, the army, led by General Eiling (guest star CLANCY BROWN), 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 (guest star KELLY FRYE), 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.

The Flash faces a new meta-human named Tony (guest star GREG FINLEY), 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 (aka DC Comic villain Girder) 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.

The Flash goes up against Farooq aka Blackout (guest star MICHAEL REVENTAR), a meta-human 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 meta-human. Meanwhile, Tockman (guest star ROBERT KNEPPER) 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.

In the first part of the epic crossover event with The Flash and Arrow, Barry is thrilled when Oliver, Felicity and Diggle join him in Central City to help stop a meta-human.

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 (guest star AMANDA PAYS) 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. And Caitlin finds Ronnie.

Leonard Snart (aka Captain Cold) returns to Central City with a new hotheaded partner in tow – Mick Rory (aka Heat Wave) (guest star DOMINIC PURCELL). 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.

Dr. Wells’ former protégée, Hartley Rathaway (guest star ANDY MIENTUS), 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 (guest star TOM BUTLER) pairs her with a veteran reporter, Mason Bridge (guest star ROGER HOWARTH), 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.

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 (guest star MALESE JOW), 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 (guest star BRITNE OLDFORD), a meta-human with teleportation powers, who just busted her boyfriend Clay (guest star MICAH PARKER) 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.

After Ronnie attacks a physicist (guest star BILL DOW), 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 (guest star VICTOR GARBER) 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 (Carlos Valdes) help to reinvestigate the murder of Nora Allen (guest star MICHELLE HARRISON). General Eiling returns to Central City.

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.

Mark Mardon aka The Weather Wizard (guest star LIAM McINTYRE) 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.

The Flash learns that Captain Cold and Heat Wave have returned to Central City. This time, however, Snart has brought along his baby sister Lisa (guest star PEYTON LIST) to help wreak havoc on the city.

A copycat killer who goes by the name “The Trickster” (guest star DEVON GRAYE) 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 (guest star MARK HAMILL), 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.

Barry is surprised when Felicity Smoak arrives from Starling City along with her boyfriend, Ray Palmer (guest star BRANDON ROUTH), who flies in as the A.T.O.M. 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 Larvin (guest star EMILY KINNEY) unleashes hundreds of robotic bees to attack and kill her former co-workers, including Dr. Tina McGee (guest star AMANDA PAYS). A group dinner with Barry, Felicity, Ray, Iris and Eddie turns into a disaster.

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 (guest star PAUL BLACKTHORNE), and Cisco meets the Black Canary (guest star KATIE CASSIDY), who asks him for a favor. Meanwhile, back in Central City, Barry races to catch a meta-human named Hannibal Bates (guest star MARTIN NOVOTNY) who can transform himself into every person he touches – including Eddie, Iris, Caitlin and even The Flash.

Barry, Caitlin, Cisco and Joe set a trap for Wells – using Cisco as prey and putting him in grave danger. Meanwhile, Eddie makes a decision regarding Iris that leaves him a bit unsettled.

While Barry deals with the Reverse Flash’s latest threat to a member of the group, 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. And Iris and Barry have a heart to heart talk.

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 – The Arrow and Firestorm (ROBBIE AMELL).

In the epic season one finale, Wells presents Barry with a life-altering choice, while Dr. Martin Stein and Ronnie Raymond (aka Firestorm) return to help the S.T.A.R. Labs team with this final fight.