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).
Dave Coulier David Alan "Dave" Coulier (born September 21, 1959) is an American actor, voice actor, stand-up comedian, impressionist and television host. He became known in the late 1980s and the early 1990s for playing Joey Gladstone on the ABC sitcom "Full House".