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.
Characters who have not appeared, but should appear, in the MCU
There are many characters in Marvel comics that have not appeared in the Marvel cinematic universe yet. If they were too, who would you want to play them?
