National Lampoon's Christmas Vacation is a film that stars an actor known for playing Dr. Leonard Hofstadter in what CBS sitcom?
Johnny Galecki John Mark Galecki (born April 30, 1975) is an American actor. He is known for playing David Healy in the ABC sitcom "Roseanne" from 1992 to 1997 and Dr. Leonard Hofstadter in the CBS sitcom "The Big Bang Theory" since 2007. Galecki also appeared in the films "National Lampoon's Christmas Vacation" (1989), "Prancer" (1989), "Suicide Kings" (1997), "I Know What You Did Last Summer" (1997), "Bookies" (2003), and "In Time" (2011).
Rusty Hamer Russell Craig "Rusty" Hamer (February 15, 1947 – January 18, 1990) was an American stage, film and television actor. He is best known for portraying Rusty Williams, the wise cracking son of entertainer Danny Williams (Danny Thomas), on the popular ABC/CBS situation comedy "Make Room for Daddy" (later retitled "The Danny Thomas Show"), from 1953 to 1964. He reprised the role in three reunion specials and the sequel series, "Make Room for Granddaddy", that aired on ABC from 1970 to 1971.