Johnny Galecki

‘The Big Bang Theory’ star landed one of his first major roles in ‘National Lampoon's Christmas Vacation’ as Rusty Griswold in 1989.

The picture tells the story of the Griswold family headed by Clark Griswold Jr (Chevy Chase) who are preparing for the festive celebrations.

However, things go disastrously wrong due to a mixture of bad luck and annoying relatives.