Updated: February 14, 2024

Charles William Mumy Jr. is an American actor and musician and a figure in the science-fiction community/comic book fandom. He came to prominence in the 1960s as a child actor, when he was credited as Billy Mumy era which included his appearing on television in The Twilight Zone and Alfred Hitchcock Presents, and on film in Dear Brigitte, followed by an iconic three-season role as Will Robinson in the 1960s CBS sci-fi series Lost in Space.