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).
Wayne Federman Wayne Federman (born June 22, 1959) is an American comedian, actor, author, comedy writer, and musician. He is noted for numerous stand-up comedy appearances in clubs, theaters, and on television; a biography of "Pistol" Pete Maravich; and supporting comedic acting roles in "The X-Files", "The Larry Sanders Show", "Curb Your Enthusiasm", "Community", "Legally Blonde", "50 First Dates", "The 40-Year-Old Virgin", and "Step Brothers". He was the head monologue writer for NBC's "Late Night with Jimmy Fallon" in its first season.