Charles William Mumy Jr. (/ ˈmuːmi /; born February 1, 1954) is an American actor, musician, pitchman, instrumentalist, voice actor, author and a figure in the science - fiction community. He came to prominence in the 1960s as a child actor, when he was credited as Billy Mumy, an era which included memorable appearances in The Twilight Zone and Alfred Hitchcock Presents television shows, as well as co-starring in Dear Brigitte with James Stewart and Brigitte Bardot, followed by an iconic three - season role as Will Robinson in the 1960s CBS sci - fi series Lost in Space.
who played will robinson on the original lost in space
Charles William Mumy Jr.