The Flash Season 2 Episode 17 "Flashback" Promo, Preview and Predictions! New details on Supergirl Flash Crossover! New Man in the iron mask theory, is the man in the iron mask Barry Allen from the future? How does Barry get to Supergirl's universe? The multiverse is explained in new promo from the Supergirl Flash crossover.
The Flash Playlist (Lots more videos): https://goo.gl/1E2yfj<> />
This contains spoilers from the Flash Season 2 up till episode 17, ans Supergirl Season 1 Episode 17.
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