Lyla e Diggle vão a Central City para avisar o Flash que o Tubarão-Rei escapou do tanque de retenção A.R.G.U.S. O vilão aparece na casa dos West e ataca Joe, Iris, Wally e Barry.

Barry pede ajuda ao Arqueiro Verde quando os alienígenas atacam a Central City, mas quando percebem que não será suficiente, eles rastrearão as Lendas do Amanhã para que eles possam trazer a Supergirl para a batalha.

With only 24 hours left until Savitar murders Iris, Barry struggles to save the woman he loves and makes the choice to use any means necessary to do so. Realizing he has one option left to save her, The Flash turns to Captain Cold for help.

When Gorilla Grodd attacks Central City, Barry and Team Flash find themselves teaming up with an unexpected ally to defeat – King Shark. However, when they hit a snag, they bring in Dr. Tanya Lamden to try to reach the man behind the shark, Shay Lamden.