Supergirl learns about Heat Wave's 'colorful' backstory as U.S. soldiers join Supergirl, Arrow, The Flash and Legends of Tomorrow in an epic battle against aliens known as the Dominators.
Supergirl learns about Heat Wave's 'colorful' backstory as U.S. soldiers join Supergirl, Arrow, The Flash and Legends of Tomorrow in an epic battle against aliens known as the Dominators.
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