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'Crisis on Infinite Earths' Sneak Peek: Supergirl Tries to Stay Hopeful Even After Losing [Spoiler] in Part 1

“Crisis on Infinite Earths” will take no prisoners, as seen in this emotional sneak peek from Part 1 of the Arrowverse’s crossover event, which kicks off this Sunday at 8/7c on The CW’s Supergirl. READ MORE & WATCH VIDEO