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.

Much to Joe's disapproval, Barry has fun with his new powers, but a setback makes him question his ability to be a hero. Iris (CANDICE PATTON) is intrigued by the "red streak."

As Barry and the team work to capture a dangerous new meta-human with toxic gas powers, they revisit the night the particle accelerator exploded and killed Caitlin's fiancé, Ronnie.

After stopping a robbery, Barry identifies the criminal. When the villain gets his hands on a stolen cold gun that could kill the Flash, Barry faces Capt. Cold in an epic fight.

After a bomb goes off downtown, Barry, Joe and the team from STAR Labs encounter Plastique, one of the army's supersoldiers who can detonate things by touching them.

The Flash faces a new meta-human named Tony (GREG FINLEY), who can turn himself into girded steel at will. Meanwhile, Joe asks Dr. Wells to help him solve Nora Allen's murder.

When The Flash goes up against Farooq aka Blackout, a meta-human who can harness electricity, he zaps The Flash and siphons all his electricity, leaving him without his speed.

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.

When Barry finds himself face to face with his nemesis, the Man in the Yellow Suit (aka Reverse Flash), who killed his mother, he turns to Dr. Tina McGee (AMANDA PAYS) for help.

When Captain Cold (WENTWORTH MILLER) returns to Central City with a hotheaded partner - Mick Rory aka Heat Wave (DOMINIC PURCELL) - they challenge The Flash to an epic battle.

Dr. Wells' former protégée, Hartley Rathaway (ANDY MIENTUS), returns to seek revenge on his mentor after being affected by the particle accelerator explosion.

Love is in the air when Caitlin decides that she and Barry need to move on from Ronnie and Iris. But when Barry meets Linda Park (MALESE JOW), Iris is surprised by her reaction.

After Ronnie attacks a physicist, Barry and the team realize he's now a dangerous meta-human and decide to track him down by finding Dr. Martin Stein (guest star VICTOR GARBER).

After the explosion separates Ronnie (ROBBIE AMELL) & Dr. Stein (VICTOR GARBER), the STAR Labs team believes both men are safe - until General Eiling targets Firestorm.

Mark Mardon aka The Weather Wizard appears in Central City to avenge his brother's death at the hands of Joe. And Cisco realizes that Dr. Wells is hiding something.

Captain Cold and Heat Wave return to Central City. But this time, Snart brings along his sister, Lisa (guest star PEYTON LIST) to wreak havoc on the city.

MARK HAMILL (Star Wars) reprises his role as James Jesse aka The Trickster, when a copycat killer (DEVON GRAYE) starts setting bombs off in Central City.

Barry is surprised when Felicity arrives in Central City with Ray Palmer who needs help from STAR Labs with his ATOM suit, while Barry needs help vs. a metahuman named Brie Larvan.

While Joe and Cisco head to Starling City for answers about Dr. Wells from Capt. Lance, Barry races to catch a meta-human who can transform into anyone he touches.

Barry, Caitlin, Cisco & Joe set a trap for Wells - using Cisco as bait. Meanwhile, Eddie makes a decision regarding Iris that leaves him 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.

As Wells once again gets the upper hand on the S.T.A.R. Labs team, Barry reaches out to an old foe, Captain Cold, and friends, the Arrow and Firestorm, for help.

In the 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.