Endgame directors the Russo brothers claim that a NOVA cameo was hidden as an Easter Egg in the film -- before clarifying that their Nova comment was a joke. Why is Nova so important to the future of the MCU, and why was this joke be taken so seriously? Erik Voss explains who Nova is, where in Avengers Endgame fans THOUGHT they found him, and how the MCU might have already established Richard Rider's introduction in a future Guardians of the Galaxy or Captain Marvel sequel.

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