Where To Stream The Flash Season 3 Episode 21
Cause and Effect
- Aired May 9, 2017
- 60 Min
- Rated 7.5
- Number 16 Of 184 Rated Episodes
Cisco comes up with a plan to stop Savitar involving preventing Barry from forming short-term memories. However, the plan doesn't go as intended. Meanwhile, Killer Frost returns to S.T.A.R. Labs to help the team.