Johnny Galecki As Rusty Griswold

Johnny Galecki was a relatively unknown actor when he told the role of the younger Griswold sibling, Rusty. Even when he got the role in Christmas Vacation, he had zero speaking lines! Seriously. No lines.

However, Christmas Vacation was not Galecki's first gig. His first acting role was the 1980s CBS show Murder Ordained. His other movie roles include A Night in the Life of Jimmy Reardon (1988), and Prancer (1989). He also appeared in a string of short films and had a promising career ahead of him.

John Galecki Now

Today, most audiences recognize John Galecki as Leonard Hofstadter from The Big Bang Theory. By 2014, he earned around $1 million per every episode. But he also appeared in several other films, such as Hancock (2008) and In Time (2011).

But Galecki's acting first skyrocketed in the '90s. He appeared in I Know What You Did Last Summer, Roseanne, and Suicide Kings. In the 2000s, Galecki seemed to focus more on sitcoms and comedies, which eventually led him to working on The Big Bang Theory.