Grandmaster, Disney Wiki

The Grandmaster is a Marvel Comics character and the secondary antagonist in most stories depicting him. He is an ancient alien being who finds enjoyment in challenging superheroes and pit them against each other. He is the brother of the Collector. Grandmaster was created by Roy Thomas and Sal Buscema. During the credits of Guardians Of The Galaxy Vol. 2, the Grandmaster can be seen dancing along to the music playing in the credits. The Grandmaster appears as the hedonistic ruler of Sakaar. He

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