The Flash arrives in National City from an alternate universe. He teams up with Supergirl to battle the villains Livewire and Silver Banshee, in exchange for Supergirl's help finding him a way to return home.moreless
Weather Wizard plans to get revenge on Flash and recruits Captain Cold and Trickster to help him. Meanwhile, Harry considers his deal with Zoom, Joe and Iris meet Wally, and Patty meets the man who killed her father.moreless
Teams Arrow and Flash go to ground to come up with a plan to stop Vandal. Malcolm arranges a meeting with the immortal villain, but it doesn't go well. While the teams try to come up with a plan, Carter tries to reawaken Kendra's memories of her past lives.moreless
A mysterious immortal named Vandal Savage comes hunting for Kendra, and Barry and Cisco take her to Star City seeking Oliver's help. Meanwhile, Caitlin and Harrison create a speed enhancer, Velocity-6, but they need Jay to test it and he refuses.moreless
Barry's confidence is crushed after Zoom cripples him, and Iris calls Henry in to help his son. Meanwhile, Grodd launches a new plan to gain others like himself, and Caitlin convinces Harrison to help them.moreless
Barry tries to lure Zoom into a trap despite Caitllin's objections, and Joe wonders if his foster son has an ulterior motive. Meanwhile, Dr. Light escapes from her prison and the team turns to her Earth-1 counterpart--Linda--for help.moreless
The Flash and his team battle Doctor Light, the newest breacher to come to Earth-1. This time, the team has Harrison Wells to help them... the Harrison from Earth-2. Meanwhile, Barry finally asks Patty on a date, and Cisco asks a new barista for her number.moreless
The team tries to find a substitute for Ronnie before Martin dies due to a lack of molecular stability. Meanwhile, Francine startles Joe with unexpected news, and Barry hesitates to become romantically involved with Patty.moreless
Lisa tells the team that her brother Len has been kidnapped. However, when Barry makes contact with the villain, he insists that he doesn't want to be rescued.
Jay Garrick, a mysterious man who claims that he's the Flash in a parallel world, warns the team about an evil speedster named Zoom who plans to destroy the Flash. While Barry wonders whether to trust the newcomer, Joe deals with Patty Spivot, an officer who wants to join the metahuman taskforce.moreless
With Star City in peril from a new gang, Laurel and Thea go behind Diggle's back and ask Oliver and Felicity to come back to help them.
Six months after the events of the Singularity, Central City holds a rally in Flash's honor. However, Barry doesn't want to attend since he knows who the true hero is who sacrificed his life to save the city. Meanwhile, a new giant-sized metahuman launches an attack on Flash.moreless
Martin and Ronnie return to S.T.A.R. Labs to help the team as Barry must make a life-changing decision thanks to Harrison's machinations.
To stop Ra's from wiping out Starling City's population, Oliver is forced to reveal his true loyalties. However, when Ra's escapes, Oliver is forced to turn to his friends for help... but they still don't trust him after his betrayal.moreless
Barry turns to Captain Cold for help when Harrison's plans threatens the imprisoned metahumans. Meanwhile, Iris makes a decision concerning herself and Eddie after the team rescues the officer from Harrison's underground base.moreless
Reverse Flash unleashes Grodd on Central City as a distraction from his own plans, and the telepathic gorilla abducts Joe.
Barry and the others manage to access Cisco's visions and try to recreate the conditions where Harrison confessed to Nora's murder in the original timeline. Meanwhile, Eddie asks a favor of Joe but is surprised at his partner's refusal.moreless
While Joe and Cisco take a road trip to Starling City to find evidence confirming Harrison's guilt, Flash deals with Everyman, a metahuman who can take the shape of anyone he touches.
Two scientists fall victim to killer bee attacks, and Barry's friends figure that a metahuman is responsible. Meanwhile, Felicity and Ray come to Central City to recruit Cisco's help in repairing Ray's Atom suit, and Ray offers to help. Meanwhile, Iris suspects that Eddie is keeping something from her and demands answers.moreless
A new terrorist calling himself Trickster launches an attack on Central City, and Joe and Barry reluctantly meet with the original Trickster, imprisoned for 20 years after a homicidal rampage. Meanwhile, in the past the events leading up to Harrison becoming Reverse Flash are revealed.moreless
Mark Mardon, Clyde's brother, recovers from his injuries and comes looking for Joe, the man who killed his brother. As Flash tries to cope with Mark's weather control powers, Cisco discovers the truth about Reverse Flash.moreless
After the nuclear explosion outside of Central City, Eiling comes after Firestorm, intent on using him to develop super-soldiers. Meanwhile, Mason asks Iris to help him investigate S.T.A.R. Labs, and Martin and Barry discuss the possibility of time travel after Joe shows Barry what he found at the old house.moreless
When the merged Martin and Ronnie attack a physicist, the team sets out to bring in "Firestorm". Meanwhile Joe recruits Cisco to help him investigate the house where Nora was murdered.