REAL NAME: Iakovos Theopalavos
OCCUPATION: Scientist, terrorist
IDENTITY: Secret
LEGAL STATUS: Citizen of Greece
OTHER ALIASES: NA
PLACE OF BIRTH: Athens, Greece
MARITAL STATUS: Widower
KNOWN RELATIVES: NA
GROUP AFFILIATIONS: Clutching Hand
BASE OF OPERATIONS: Mobile
FIRST APPEARANCE: Lightning Comics vol. 2 #1 (June 1941)
HEIGHT: 6' 2"
WEIGHT: 230 lbs
EYES: Yellow
HAIR: Black
"Mastermind created machines that could temporarily empower him by harnessing the energy of thunderstorms.
His experiments had an unexpected side effect by changing his appearance, giving his eyes an unusual yellow color, as well as making his skin extremely pale."
POWERS & WEAPONS
His powers included lightning projection, teleportation, and super strength.
In addition to his superior intellect and powers, Mastermind was also skilled in hand-to-hand combat and with weapons, such as swords and firearms.