The_flash_2014_3x21_causa_ed_effetto_ita_1080p_... (2026)

The plan goes awry, causing Barry to lose his entire memory. He begins going by the name "Bart" .

The episode ends with the reveal that the team needs a power source stronger than the sun to fuel the Speed Force Bazooka—specifically, a Dominator crystal guarded by King Shark .

Following the reveal that the villain is a time remnant of Barry Allen, Team Flash attempts to stop him by preventing Barry from forming new memories. Their logic is that since Savitar is a future version of Barry, he remembers everything Barry does.

The episode shows brief glimpses of Caitlin Snow fighting to regain control from her Killer Frost persona, particularly after a heartfelt moment with Cisco.