Supergirl 3x08 Promo “Crisis on Earth-X, Part 1“ (HD) Season 3 Episode 8 Promo - Crossover Event

Supergirl 3x08 “Crisis on Earth-X, Part 1“ Season 3 Episode 8 Promo - THE EPIC FOUR-WAY CROSSOVER WITH “ARROW,” “SUPERGIRL,” “THE FLASH ...