Barry Allen, a kind-hearted police scientist, gains super speed after a lab accident and becomes The Flash, a hero dedicated to protecting Central City from danger.
Series premiere. Central City forensic scientist Barry Allen 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 is intrigued by the Red Streak.
Barry and the team hunt a new meta-human with toxic gas powers, forcing them to revisit the tragic night the particle accelerator explosion killed Caitlin’s fiancé.
Barry stops a robbery and identifies the culprit, but when the villain steals a deadly cold gun, The Flash faces off against the formidable Captain Cold.
A downtown bombing leads Barry, Joe, and the STAR Labs team to Plastique, a super-soldier who can trigger powerful explosions with just a touch.
The Flash faces a new meta-human named Tony, 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 Blackout, a meta-human who can harness electricity, he zaps The Flash and siphons all his electricity, leaving him without his speed.
A man is excited to team up with three people in a city to stop a dangerous meta-human.
When Barry finds himself face to face with his nemesis, the Man in the Yellow Suit (AKA The Reverse Flash), who killed his mother, he turns to Dr. Tina McGee for help.
A hero's enemies, Captain Cold and Heat Wave, return to challenge him to an intense showdown.
Dr. Wells’ former protegee, Hartley Rathaway, 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, 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.
After the explosion separates Ronnie and Dr. Stein, 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. 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, to wreak havoc on the city.
James Jesse AKA The Trickster is back. A copycat killer starts setting bombs off in Central City. Guest star - Mark Hamill.
Barry is surprised when Felicity arrives with Ray Palmer who needs help from STAR Labs with his ATOM suit, while Barry needs help with a meta-human named Brie Larvan.
While Joe and Cisco head to Starling City for answers about Dr. Wells from Captain Lance, Barry races to catch a meta-human who can transform into anyone he touches.
Barry, Caitlin, Cisco and 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 STAR Labs team, Barry reaches out to an old foe, Captain Cold, and friends, The Arrow and Firestorm, for help.
Season finale. Wells presents Barry with a life-altering choice, while Dr. Martin Stein and Ronnie Raymond (AKA Firestorm) return to help the STAR Labs team.
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