Watch The Flash Online: Season 4 Episode 21

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Did the team manage to end DeVoe's reign of terror for good?

That was the plan on The Flash Season 4 Episode 21 as the villain's device neared completion. 

Meanwhile, Amunet joined in on the fight against DeVoe, and it gave Caitlin the courage to confront her fears about losing her metahuman persona. 

Meanwhile, Harry continued to spiral out of control after it emerged that he was losing his memory. 

Use the video above to watch The Flash online right here via TV Fanatic. 

Get caught up with all the latest developments as the characters try to win the war. 

Paul Dailly is the Associate Editor for TV Fanatic. Follow him on Twitter.

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The Flash Season 4 Episode 21 Quotes

Amunet: Besides, you know what they say. A zebra never changes it's stripes.
Joe: Flash
Amunet: Oh Flash, you really do stop all the crime in the city don't you.

Cisco: Look at this man.
Other Harry: I see him.
Cisco: Is he not one of your own? Are you telling me you're going to betray one of your own because he doesn't meet some arbitrary intellectual standard?