Real Name: Martinique Jason
Code-Name: Mastermind
Identity: Secret
Occupation: Professional criminal and current owner of Arcade's abondoned Murderworld
Legal Status: No known criminal record
Place of Birth: Unrevealed
Marital Status: Single
Known Relatives: Jason Wyngarde (Father, Mastermind), Regan Wyngarde (Sister, Lady Mastermind)
Group Affiliation: Brotherhood of Mutants III
Base of Operations: Mobile
Height: 5'10"
Weight: 126 lbs.
Eyes: Gray-Black
Hair: Brown
Other distinguishing features: None
Strength level: Normal
Known superhuman powers: Mastermind had the psionic ability to cast illusions, causing people to see, hear, touch, smell, or taste things which did not actually exist. She can also cause people to see, hear, touch, smell, or taste things in ways they would not naturally; for example, she could make herself look and sound like a different person, or look and feel like a wall, or even seem invisible. Martinique is also a novice telepath.