Watch The Flash Online: Season 3 Episode 21

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What was Killer Frost's proposal?

That was a key question on The Flash Season 3 Episode 21 when the villain emerged from the shadows with some interesting intel. Some VERY interesting intel.

Meanwhile, Barry took drastic measures in his quest to stop Savitar's vision from coming true, but he quickly realized there was more to the tale than he thought was possible. 

Also, H.R. continued to try and get Tracy Brand to design the trap for Savitar, but what did Barry have to say about it?

Use the video above to watch The Flash online to get caught up with all the drama. 

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

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