<Tr> <Th> Children </Th> <Td> Seth Mumy (b . 1989) Liliana Mumy (b . 1994) </Td> </Tr> <Tr> <Th> Website </Th> <Td> billmumy.com </Td> </Tr> <P> 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 . </P> <P> He later appeared as lonely teenager Sterling North in the Disney film Rascal (1969), with Steve Forrest . He played Teft in the film Bless the Beasts and Children (1971). </P>

Who played will robinson on the original lost in space