Watch The Flash Season 3 Episode 21 Full HD Online with SUB

Savitar explains that he is a temporary remnant of Barry, created by his future self while fighting Savitar. After being shunned by the Flash team, the rest of the time fell into a depression and ran back in time to eventually become Savitar. He explains that he needs to kill Iris so that Barry will be forced to create it in the future. Cisco suggests that they stop Savitar from memorizing any of their strategies by stopping Barry from creating new memories, but miscalculations cause Barry to lose his memory. Savitar also loses all of his memories, causing Wally's powers to disappear, as Savitar never gave them to him. A pyromaniac named Lucius Coolidge is released due to Barry's inability to give a proper statement. Killer Frost helps Cisco and Julian work out a way for Barry to restore his memories so that Savitar can do it too. When Coolidge starts a fire, Iris helps Barry recover his memories in time to stop the fire with Wally's help. Tracy and H. R. develop a romantic relationship. She then shows the team the completed speed force trap, which requires a large amount of energy. The final scene moves into a room that has an alien power source as well as a Shark King.