Charles William Mumy Jr. is an American actor, writer, producer, and musician. He came to prominence in the 1960s as a child actor, whose work included television appearances on Bewitched, I Dream of Jeannie, The Twilight Zone, Alfred Hitchcock Presents, and a role in the film Dear Brigitte, followed by a three-season role as Will Robinson in the 1960s sci-fi series Lost in Space. Mumy later appeared as lonely teenager Sterling North in the film Rascal (1969) and Teft in the film Bless the Beasts and Children (1971).