Watch The Flash S04e21 Webrip X264-ion10-1 -

Rather than downloading unverified files, you can watch this episode through official platforms as of April 2026: Amazon Prime Video

: With Clifford DeVoe’s "Enlightenment" device nearly complete, Team Flash seeks an unlikely alliance with Amunet Black to find a weapon capable of disabling his satellites. Subplots : Watch The flash s04e21 webrip x264-ion10-1

: Iris decides to publish an article exposing DeVoe’s plan to the public, hoping the citizens of Central City can help track him. Rather than downloading unverified files, you can watch

: After being kicked out of the "Council of Wells," Cisco helps a struggling Harry find a new group—the "Council of Harrisons"—to help him regain his declining intelligence. Rather than downloading unverified files

: Caitlin works with Amunet in hopes of finding a way to bring back Killer Frost . Official Streaming Options