The Reverse Flash taunts Kid Flash, and warns of repercussions if Barry continues to forget his old life; when disaster strikes, Barry must decide whether to live as Barry Allen or return to his universe as The Flash.
Barry realizes he underestimated the effects from Flashpoint; after meeting his new co-worker, Julian Albert, Barry is surprised at the man's immediate disdain for him.
Wells asks Barry and Caitlin to talk Jesse out of using her speedster powers; Magenta uses a power to control metal to terrorize the city.
Mirror Master joins his old partner, Top, and looks to even the score with Snart; Jesse joins the chase, but her decision to defy one of Barry's orders results in terrible consequences.
Caitlin visits her mother to help her understand her growing meta-human powers; Barry tries to convince Julian to let him help investigate a new meta-human that is attacking Central City.
Wally starts having dreams about being Kid Flash, making Barry realize he must tell Wally, Iris and Joe what happened to Wally in Flashpoint.
Caitlin's inner Killer Frost is unleashed after she uses her powers to save Barry; on a rampage, Killer Frost goes looking for Dr. Alchemy, kidnaps Julian and battles both The Flash and Vibe; Joe and H.R. have an honest discussion.
Barry asks Green Arrow for help when aliens attack Central City, but when they realize that won't be enough, they track down the Legends of Tomorrow so they can bring Supergirl in on the battle.
Barry heads for Earth-3 to get advice from Jay Garrick on how to stop Savitar; Wally tells Barry he's been training with H.R.; old wounds are reopened as Cisco faces Christmas without Dante.
Barry has a vision of the future, where Iris is killed by Savitar; a criminal named Plunder emerges in Central City; unsure of why Barry hesitates to stop Plunder, Wally decides to take action as Kid Flash; Caitlin offers Julian a job.
H.R.'s past catches up with him when a bounty hunter comes to Central City to bring him back to Earth-19 to stand trial for his crime.
Barry and the team at S.T.A.R. Labs try to bring down a meta-human who is killing people by causing them to decompose at an accelerated rate; The Flash mentors Kid Flash and begins to elevate the newer speedster's training to another level.
Barry, Caitlin, Cisco and Julian head to Earth-2 on a rescue mission to save Harry from Gorilla City; on Earth-1, Jesse and Kid Flash attempt to stop a metahuman that can control gravity.
Flash and the team must find a way to stop Grodd and his army of gorillas when Grodd brings the battle to Earth-1; Jesse Quick decides she wants to stay with Wally on Earth-1.
While training with Barry, Wally starts to have visions of Savitar, which he hides from the team; a dangerous secret threatens Barry and Iris' happiness.
Desperate to stop Savitar and save his friends, Barry turns to the speed force for answers; H.R. gives Jesse some advice.
Mon-El and Hank Henshaw arrive carrying a comatose Supergirl, who was attacked by the Music Meister; when the Music Meister attacks Barry, both he and Supergirl wake up in an alternate reality that they have to sing and dance their way out of.
The Flash battles Earth-19 villain Abra Kadabra, who offers to tell him Savitar's true identity if he lets him go; Gypsy tries to take Abra Kadabra for her own reasons, accidentally allowing him to escape.
Barry travels to the future to find out Savitar's still unknown identity in the hope of saving Iris; the hunt for Killer Frost continues in 2017.
Barry and the team meet Tracy Brand, a scientist who may be the key to stopping Savitar; Joe and Cecile's relationship takes a big turn.
Barry goes to extreme measures to stop Savitar; H.R. pushes Tracy Brand to design a trap; Killer Frost returns with an interesting proposal.
Barry chooses to use any means necessary to save the woman he loves; The Flash turns to Captain Cold for help.