Liam Martin is a former child actor who provided the voice of Linus van Pelt in the 1977 film Race for Your Life, Charlie Brown and in two Peanuts television specials, You're a Good Sport, Charlie Brown (for which he also provided the voice of Schroeder) and It's Arbor Day, Charlie Brown. Martin provided the voice of Charlie Brown in What a Nightmare, Charlie Brown and voiced Linus in the Peanuts 25th anniversary special Happy Anniversary, Charlie Brown.