Trailer for Supergirl / The Flash crossover episode

CBS have released a trailer for their big Supergirl cross-over event with The CW's The Flash, which will see the DC speedster head over to National City (via - we assume - one of those multiverse wormholes).

World's Finest looks to be a lot of fun. Over here in the UK, we'll likely see the episode in June as Supergirl doesn't return to Sky1 until the start of April.

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