The Flash Season 3 Episode 21: Watch Online!

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The Flash Season 3 Episode 21 was titled "Cause and Effect."

As for what actually transpired during the intense and enjoyable hour? Scroll down for a quick summary...

On this installment of the beloved CW series, Barry was forced to take drastic measures in order to stop Savitar.

Meanwhile, H.R. continued to push Tracy Brand to design the trap for Savitar; and Killer Frost returned with an interesting proposal.

What was it? How did it impact members of the team? And on what kind of cliffhanger did the episode conclude?

Click on the video above to watch The Flash online and find out now!

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