21. Cause and Effect (2017)
Barry takes drastic measures to stop Savitar. Meanwhile, H.R. continues to push Tracy Brand to design the trap for Savitar and Killer Frost returns with an interesting proposal.
Release date: 2017-05-09
User rating:
7.4 / 10
30 votes
Season number: 3
Episode number: 21
Runtime: 42 minutes
Director: David McWhirter
Writers: Lauren Certo, Judalina Neira
