caught up with her she was burning her research and ready to throw in the science towel. According to Future Barry, Tracy was the one who developed the technology to trap Savitar in the speedforce in the future. Tonight's episode introduced Tracy Brand ('Covert Affairs' alum Anne Dudek.) Tracy was studying theoretical physics in school when Barry, H.R., and Cisco went to find her. With only three episodes left after tonight, Barry and the team are really going to have to think outside the box to trap Savitar, especially now that they know the terrifying truth about his identity. Tonight's episode really challenged a lot of relationships, especially Caitlin and Cisco's, as Cisco was pushed to the brink and forced to use his powers against her. Joe West also took his relationship with Cecile to the next level after she said 'I love you' and he got permission from Barry to tell her about The Flash and Kid Flash. Tracy is the only person who can trap Savitar in the speedforce, so both Team Flash and Team Savitar were after her this week. Her transformation into Killer Frost took another turn this week, as Savitar had her hunt down genius physicist Tracy Brand. The revealing of his identity also explains why Caitlin was so willing to trust him last week, why she was so quick to do his bidding. His unmasking will change everything for Team Flash in upcoming episodes because Savitar's identity will affect each of them on a dark, personal level. Tonight's episode - 'I Know Who You Are' - carried with it the revelation fans of 'The Flash' have been waiting for all season - the true identity of Savitar.

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