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.
After battling a crook in the subway, a strange alien creature attaches to him while fighting the crook. It changes his personality in aggressive ways. He detaches it only to find out it bonded to a co-worker at The Daily Bugle named Eddie Brock and becomes a killing machine.
