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Following the events of this week's episode in which Team Flash faced off against "The Wrath of Savitar," Barry (Grant Gustin) will have to enter the Speed Force, where he'll come face-to-face with ghosts from the past.
Check out the first clip from DC's Legends of Tomorrow.
Though the concept of Legends of Tomorrow seemed like a strange pitch, one of the weirdest things about the spinoff series is that it added a few well-known villains to the hero roster.