Dr. Stein needs a stabilizing force to keep from exploding, and the team finds two potential matches. Patty and Barry track down a man-shark.
A peek at Earth-2 reveals tension between Jay and Dr. Wells. The latest metahuman stalking the Flash, Dr. Light, resembles a woman from Barry's past.
The team recruits an unlikely ally for its plan to capture Zoom. Cisco tries using his newfound powers on Earth-2. Dr. Wells, Barry and Zoom face off.
Barry's confidence is shaken, and Earth-2 Dr. Wells must step in to rescue Caitlin from Grodd, a superintelligent gorilla who feels angry and alone.
Vandal Savage poses a new threat to Central City -- he's dangerous and powerful, but not a metahuman. Barry turns to the Arrow for help.
Zoom offers Dr. Wells a deal he can't refuse. The Trickster delivers a Christmas surprise, leaving Barry with a hard choice. Iris tells Joe the truth.
Barry and Patty's special night out is interrupted by an attack by the Turtle. Jay reveals he's ill. Joe and Wally try being father and son.
The Reverse-Flash kidnaps Dr. McGee in an attempt to return to his own time. Cisco finds the key to tapping his powers. The timeline ruptures.
Barry is losing speed, but can't pinpoint why. Iris plots to keep Wally safe from drag racing, and they both end up in the way of Tar Pit's revenge.
In a bold plan, the team heads to Earth-2 after sealing the breaches. Barry steps into his doppelgänger's life and gets distracted from the mission.
Geomancer wreaks havoc on Earth-1. Iris's editor raises doubts about the Flash's heroism. In Zoom's lair, the Man in the Iron Mask taps out a message.
King Shark is on the loose and determined to kill the Flash. Barry and Wally have trouble seeing eye to eye. Zoom's true identity is revealed.
A new speedster named Trajectory appears and is able to outrun Barry. She breaks into S.T.A.R. Labs looking for even more power, at any cost.
Barry gets a lesson in how time travel works -- and the new dangers it holds -- when he runs into the past to find out how to get faster.
The team pieces together Zoom's origin story and uses it to concoct a trap. But when Wally ends up in danger, Barry is forced to make a sacrifice.
A metahuman with super strength comes to Dr. Wells looking for a cure. Caitlin and Killer Frost swap life stories while imprisoned in Zoom's lair.
The team uses its scientific skills to cover up for Barry's missing powers. Zoom and Caitlin return to Earth-1. Barry faces a risky decision.
Barry takes a journey through the speed force, revisiting important moments and people in his life. Re-creating the accident has an unexpected effect.
Zoom and his new pack of metahumans are ravaging Earth-1. Barry feels unstoppable, but Zoom is intent on proving that they are more alike than not.
Zoom challenges Barry to a race, but the team suspects a trap and tries to talk Barry out of it. Only one speedster will survive the epic final fight.
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