Grandmaster (portrayed by Jeff Goldblum) is an ancient alien being (Just like the Collector) who is morally ambiguous. He likes to challenge superheroes and pit them against each other. He is very intelligent and calculating.
- The Grandmaster will become Jeffrey, Jaden and Hiccup's enemy in Jeffrey, Jaden, Hiccup & Friends' Storm Adventures of Thor: Ragnarok.
- Though they are not fond of him, The Rogues maintain a partnership with the Grandmaster out of necessity-he has access to intelligence regarding the movements of Interdimensional Black Ops.