Episode 1 | Pilot

CSI investigator Barry Allen awakens from a coma, nine months after he was hit by lightning, and discovers he has superhuman speed.

Episode 2 | Fastest Man Alive

Barry takes on a group of armed men at an awards ceremony, but side effects from his new super power catch up with him.

Episode 3 | Things You Can't Outrun

Barry and Joe track a deadly metahuman with toxic gas powers, and Caitlin relives the night of the explosion that killed her fiancé.

Episode 4 | Going Rogue

To steal a priceless diamond, Captain Cold acquires a specialized gun that can slay the Flash. Joe disapproves of Eddie and Iris dating.

Episode 5 | Plastique

While trying to get Iris to stop blogging about the Flash, Barry investigates a general's connection to an explosive meta-human.

Episode 6 | The Flash Is Born

Barry takes on his childhood bully, who can now turn himself into steel. Iris finally coins the moniker "the Flash."

Episode 7 | Power Outage

Using his meta-human power to siphon electricity, Blackout robs Barry of his speed, then sets his sights on S.T.A.R. labs and Dr. Wells.

Episode 8 | Flash vs. Arrow

The Arrow comes to Central City in pursuit of a felon. Barry hopes to team up, but a meta-human who can control emotions turns one against the other.

Episode 9 | The Man in the Yellow Suit

During the holidays, the Flash confronts the Reverse-Flash, the man who killed his mother. Caitlin gets surprising news about her fiancé, Ronnie.

Episode 10 | Revenge of the Rogues

While the Flash prepares to vanquish the Reverse-Flash, Captain Cold, teamed with Heat Wave, comes looking for a fight.

Episode 11 | The Sound and the Fury

While Iris faces trouble in her new job, a former protégé of Dr. Wells uses sound waves to attack the Flash.

Episode 12 | Crazy for You

Caitlin brings Barry out to a karaoke bar, hoping they both meet someone new; Cisco thinks about Hartley's dangerous proposition; Henry's snooping gets him into trouble.

Episode 13 | The Nuclear Man

After Ronnie kills a physicist, Barry and the team go after him. Joe enlists Cisco's help in the reinvestigation of Nora Allen's murder. Barry struggles with a new relationship and his duties as The Flash.

Episode 14 | Fallout

After the nuclear explosion separates Ronnie and Dr. Stein, Barry and the team believe both men are safe. Barry gets some important information about time travel.

Episode 15 | Out of Time

Mark Mardon, returns to seek revenge on Joe for the death of Clyde, bearing the same weather-manipulation powers as his deceased sibling.

Episode 16 | Rogue Time

The Flash learns that Captain Cold and Heat Wave have returned to Central City. This time Snart has brought along his sociopathic baby sister Lisa to help wreak havoc on the city.

Episode 17 | Tricksters

James Jesse, a.k.a. The Trickster, once terrorized Central City twenty years ago. Now a copycat has arisen to carry on the name and resume his murderous misdeeds.

Episode 18 | All Star Team Up

Felicity Smoak and Ray Palmer come to Central City seeking help with Ray's suit; an ex-employee releases deadly robotic bees; a group dinner does not go as planned.

Episode 19 | Who Is Harrison Wells?

Joe and Cisco visit Starling City and ask Captain Lance for help with their investigation into Dr. Wells; Laurel asks Cisco for a favor; Barry faces a new foe who can disguise himself as anyone he touches.

Episode 20 | The Trap

Barry, Caitlin, Cisco and Joe set a trap for Wells. Cisco uses himself as bait, which puts him in great danger. Meanwhile, Eddie makes a decision regarding Iris, which leaves Joe a bit unsettled.

Episode 21 | Grodd Lives

Knowing it's a deliberate distraction from Dr. Wells, Barry and those at S.T.A.R. Labs can't help but deal with an angry, mind-controlling meta-gorilla.

Episode 22 | Rogue Air

When Dr. Wells reactivates the Particle Accelerator, Barry must move the imprisoned meta-humans away. To do that, he needs help, and he chooses to ask Captain Cold for it.

Episode 23 | Fast Enough

With the Particle Accelerator back online, Barry can go back in time to stop Eobard Thawne on the night of his mother's murder fifteen years ago.