Charles William Mumy Jr. (born February 1, 1954) 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—an 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.
He later appeared as lonely teenager Sterling North in the Disney film Rascal (1969) and Teft in the film Bless the Beasts and Children (1971).
In the 1990s, he performed the role of Lennier in all five seasons of the syndicated sci-fi TV series Babylon 5 and narrated A&E Network's Emmy Award-winning series Biography.
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