Mystique is a Marvel Comics character who is an amoral mutant shapeshifter and an enemy of the X-Men, and she appears in Marvel Disk Wars: The Avengers.
Mystique's name can be seen on one of the news tickets, noted being questioned in a string of bank robberies.
Spider-Man imagines the musical "Mutant and the Beast" starring Mystique and Beast.
Mystique was hired by Red Skull to steal the DISKS and give them to Crossbones. She disguised herself as Pepper Potts and got the DISKS containing Baron Zemo, Abomination, Graviton, M.O.D.O.K. and Tiger Shark, but after she handed them to Crossbones, he betrayed her and knocked her out to be found by the authorities.