Age: 51
male
Johnny Galecki is a Belgian-born American actor, best known for his roles as David Healy in Roseanne, Rusty Griswold in National Lampoon's Christmas Vacation, and as Leonard Hofstadter in The Big Bang Theory.
Johnny Galecki
Iron Man
for Iron Man in Alternate Marvel Cinematic Universe
Suggested by batmanfan662
Cast whoever you want as ALREADY EXISTING MCU characters and DON'T cast people who already had the role.
