Filmography

• Wizard of Baghdad (1960)
• Tammy Tell Me True (1961)
• Sammy the Way Out Seal (1962) (as Petey Loomis)
• A Child Is Waiting (1963) (as Boy Counting Jean's Pearls)
• Palm Springs Weekend (1963)
• A Ticklish Affair (1963) (as Alex)
• For the Love of Willadean (1964) (as Freddy Gray)
• Dear Brigitte (1965) (as Erasmus)
• Lost in Space (1965-1968) (as Will)
• Wild in the Streets (1968)
• Rascal (1969) (as Sterling North)

Roles when Billy Mumy was older than 15

• Bless the Beasts & Children (1971)

Guest Appearances

• The Twilight Zone (1959-1965) ("It's A Good Life" ep. 3.08 1961)
• The Twilight Zone (1959-1965) ("Long Distance Call" ep. 2.22 1961)
• Alfred Hitchcock Presents (1961) (7.02 "Bang! You're Dead")
• Dr. Kildare (1962) ("Bronc-Buster" ep. 1.22)
• Alfred Hitchcock Presents (1962) ("Door Without a Key" ep. 7.15)
• Alfred Hitchcock Hour (1962) ("House Guest" ep. 1.08)
• Wagon Train (1962) ("The Sam Darland Story" ep. 6.15)
• Perry Mason (1963) ("Case of the Shifty Shoebox" ep. 7.02)
• The Twilight Zone (1959-1965) ("In Praise of Pip" ep. 5.01 1963)
• The Fugitive (1964) ("Home Is the Hunted" ep. 1.15)
• Bewitched (1964) ("Vision of Sugar Plums" ep. 1.15)
• I Dream of Jeannie (1965) (1.11 "Whatever Became of Baby Custer?")
• The Munsters (1964-1966) (1.25 "Come Back Little Googie" 1965)
• Bewitched (1965) (2.10 "Junior Executive")
• The Virginian (1965) (3.28 "Old Cowboy")
• Ben Casey (1965) (4.29 "Did Your Mother Come from Ireland..?")