The Challenger's New Name is Grandmaster Prime

After having something personal stolen from him centuries ago, the Challenger makes a shocking declaration in Avengers #688.

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Challenger (Elder of the Universe) (Earth-616)

Marvel Comics Legacy & Avengers #689 Spoilers: No Surrender Part

Grandmaster, Marvel Database

Challenger (Elder of the Universe) (Earth-616)

Who is Marvel's Challenger? Victory is his hobby.

Marvel Comics Legacy & Avengers #689 Spoilers: No Surrender Part

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Challenger (Elder of the Universe) (Earth-616)