Barry goes back in time, Cisco understands nothing, yesterday begins again.
Wells tells Barrem that he has torn open the space, but he does not want to know what happened in the future, the doctor says that Barry must repeat everything from the previous day.
Barry manages to catch Mardon and lock him in a special room for the meta people in Star Labs, Wells is not happy to say that this is how he changed the future.
Captain Cold and Heart Have return to Central City, but they have a new ally - Lisa Snart (Golden Glider) - Captain Cold's younger sister.
Meanwhile, Caitlin accompanies Cisco on the birthday of his brother Dante.
Barry tries to move again in time, but he fails.
Joe comes to Star Labs to find out why Barry is behaving so strangely and why he did not tell him about catching Mardon.
Dante teases his brother and humiliates him at Caitlin.
Barry breaks up with Linda, realizes that she loves Iris more with whom she wants to talk immediately.
Cisco meets a random girl in the bar who pretends to be interested in it - it turns out to be a trap and the girl is Captain Cold's sister who kidnapped Dante and releases him only when Cisco builds a gun.
Barry makes an appointment with Iris at the coffee shop, claiming she loves him too, but she says she still loves Eddie.
Joe informs you that the frost has returned.
Frost together with his sister demolish the casino, Flash appears, which takes over Lisa.
Snart tells Flash that he has Cisco.
Dante takes an honest conversation with her brother and then attacks Mick.
Frost wants to find out who Flash is, but Cisco does not want to answer, angry Capitan takes revenge on Dante.
Cisco suddenly appears in Star Labs, tells his friends that he told the party who Flash is, he wants to save his brother, decides to leave Star Labs, he does not want to expose his friends anymore.
Flash captivates Captain Cold with whom he conducts a conversation.
Caitlin manages to reconcile Eddie with Barry, telling him that he is suffering from mood swings because of electrocution.
Mason Bridge is attacked by antiflash.
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