Supergirl 6×12 “John Diggle Green Lantern Tease” Scene Worlds Await

John Diggle (guest star David Ramsey) gives new hero Guardian some advice from Jefferson Pierce (Black Lightning) and wishes her luck. He then goes back to Metropolis repeating the “worlds await” phrase from the voices in his head. Will Diggle become the Green Lantern in the Arrowverse?

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