| Loretta Young Show My Own Master Rennie (as Billy Mumy) | 12/18/1960 |
| Loretta Young Show The Lie Jimmy Harrison (as Billy Mumy) | 01/22/1961 |
| Twilight Zone Long Distance Call Billy Bayles | 03/31/1961 |
 | Alfred Hitchcock Presents Bang, You're Dead Jackie Chester (as Billy Mumy) | 10/17/1961 |
 | Alfred Hitchcock Presents Bang, You're Dead Jackie Chester (as Billy Mumy) | 10/17/1961 |
| Twilight Zone It's a Good Life Anthony Fremont | 11/03/1961 |
| Alfred Hitchcock Presents The Door Without a Key Mickey Hollins (as Billy Mumy) | 01/16/1962 |
| Wide Country The Royce Bennett Story David Bennett (as Billy Mumy) | 09/20/1962 |
| Alfred Hitchcock Hour House Guest Tony Mitchell (as Billy Mumy) | 11/08/1962 |
| Twilight Zone In Praise of Pip Young Pip | 09/27/1963 |
| Perry Mason Case of the Shifty Shoebox Miles | 10/03/1963 |
| Greatest Show on Earth Lady in Limbo Jeff (as Billy Mumy) | 12/10/1963 |
| Fugitive Home Is the Hunted David Taft (as Billy Mumy) | 01/07/1964 |
| Eleventh Hour Sunday Father Barry | 01/08/1964 |
| Bewitched A Vision of Sugar Plums Michael | 12/24/1964 |
 | Munsters Come Back Little Googie Googie Miller | 03/11/1965 |
 | Lost in Space The Reluctant Stowaway Will Robinson | 09/15/1965 |
 | Lost in Space Island in the Sky Will Robinson | 09/29/1965 |
 | Lost in Space There Were Giants in the Earth Will Robinson | 10/06/1965 |
| Lost in Space My Friend, Mr. Nobody Will Robinson | 10/27/1965 |
| Lost in Space Invaders from the Fifth Dimension Will Robinson | 11/03/1965 |
| I Dream of Jeannie Whatever Became of Baby Custer? Custer (as Billy Mumy) | 11/27/1965 |
| Lost in Space One of Our Dogs Is Missing Will Robinson | 12/08/1965 |
| Lost in Space Return from Outer Space Will Robinson | 12/29/1965 |
| Lost in Space The Space Trader Will Robinson | 03/09/1966 |
| Lost in Space His Majesty Smith Will Robinson | 03/16/1966 |
| Lost in Space All That Glitters Will Robinson | 04/06/1966 |
| Lost in Space A Change of Space Will Robinson | 04/20/1966 |
| Lost in Space Follow the Leader Will Robinson | 04/27/1966 |
| Lost in Space Blast Off Into Space Will Robinson | 09/14/1966 |
 | Lost in Space Wild Adventure Will Robinson | 09/21/1966 |
| Lost in Space Space Circus Will Robinson | 10/12/1966 |
| Lost in Space The Android Machine Will Robinson | 10/26/1966 |
 | Lost in Space A Visit To Hades Will Robinson | 11/30/1966 |
| Lost in Space The Golden Man Will Robinson | 12/21/1966 |
| Lost in Space Mutiny in Space Will Robinson | 02/01/1967 |
| Lost in Space Rocket to Earth Will Robinson | 02/15/1967 |
| Lost in Space Cave of the Wizards Will Robinson | 02/22/1967 |
| Lost in Space Revolt of the Androids Will Robinson | 03/08/1967 |
 | Lost in Space The Colonists Will Robinson | 03/15/1967 |
| Lost in Space Trip Through the Robot Will Robinson | 03/22/1967 |
| Lost in Space The Phantom Family Will Robinson | 03/29/1967 |
| Lost in Space The Mechanical Men Will Robinson | 04/05/1967 |
| Lost in Space The Astral Traveller Will Robinson | 04/12/1967 |
| Lost in Space Condemned of Space Will Robinson | 09/06/1967 |
| Lost in Space Kidnapped in Space Will Robinson | 09/20/1967 |
| Lost in Space Hunter's Moon Will Robinson | 09/27/1967 |
| Lost in Space The Space Primevals Will Robinson | 10/04/1967 |
| Lost in Space The Space Destructors Will Robinson | 10/11/1967 |
| Lost in Space Flight Into the Future Will Robinson | 10/25/1967 |
| Lost in Space Collision of the Planets Will Robinson | 11/08/1967 |
| Lost in Space Deadliest of the Species Will Robinson | 11/22/1967 |
| Lost in Space A Day at the Zoo Will Robinson | 11/29/1967 |
| Lost in Space Castles in Space Will Robinson | 12/20/1967 |
| Lost in Space The Anti-Matter Man Will Robinson | 12/27/1967 |
| Lost in Space Target: Earth Will Robinson | 01/03/1968 |
| Lost in Space Princess of Space Will Robinson | 01/10/1968 |
| Lost in Space Fugitives in Space Will Robinson | 01/31/1968 |
| Lost in Space Space Beauty Will Robinson | 02/14/1968 |
| Lost in Space The Great Vegetable Rebellion Will Robinson | 02/28/1968 |
| Lost in Space Junkyard of Space Will Robinson | 03/06/1968 |
| Wonderful World of Disney Rascal: Part 1 Sterling North | 02/11/1973 |
 | Rockford Files Backlash of the Hunter Nick Butler | 03/27/1974 |
| Rockford Files Aura Lee, Farewell Trask | 01/03/1975 |
| Babylon 5 Midnight on the Firing Line Lennier | 01/26/1994 |
| Babylon 5 Soul Hunter Lennier | 02/02/1994 |
| Babylon 5 Born to the Purple Lennier | 02/09/1994 |
| Babylon 5 Infection Lennier | 02/16/1994 |
| Babylon 5 The Parliament of Dreams Lennier | 02/23/1994 |
| Babylon 5 Mind War Lennier | 03/02/1994 |
| Babylon 5 The War Prayer Lennier | 03/09/1994 |
| Babylon 5 And the Sky Full of Stars Lennier | 03/16/1994 |
| Babylon 5 Deathwalker Lennier | 04/20/1994 |
| Babylon 5 Believers Lennier | 04/27/1994 |
| Babylon 5 Survivors Lennier | 05/04/1994 |
| Babylon 5 By Any Means Necessary Lennier | 05/11/1994 |
| Babylon 5 Signs and Portents Lennier | 05/18/1994 |
| Babylon 5 TKO Lennier | 05/25/1994 |
| Babylon 5 Grail Lennier | 07/06/1994 |
| Babylon 5 Eyes Lennier | 07/13/1994 |
| Babylon 5 Legacies Lennier | 07/20/1994 |
| Babylon 5 A Voice in the Wilderness: Part 1 Lennier | 07/27/1994 |
| Babylon 5 A Voice in the Wilderness: Part 2 Lennier | 08/03/1994 |
| Babylon 5 Babylon Squared Lennier | 08/10/1994 |
| Babylon 5 The Quality of Mercy Lennier | 08/17/1994 |
| Babylon 5 Chrysalis Lennier | 10/26/1994 |
| Babylon 5 Points of Departure Lennier | 11/02/1994 |
| Babylon 5 Revelations Lennier | 11/09/1994 |
| Babylon 5 The Geometry of Shadows Lennier | 11/16/1994 |
| Babylon 5 A Distant Star Lennier | 11/23/1994 |
| Babylon 5 The Long Dark Lennier | 11/30/1994 |
| Babylon 5 Spider in the Web Lennier | 12/07/1994 |
| Babylon 5 Soul Mates Lennier | 12/14/1994 |
| Babylon 5 A Race Through Dark Places Lennier | 01/25/1995 |
| Babylon 5 The Coming of Shadows Lennier | 02/01/1995 |
| Babylon 5 GROPOS Lennier | 02/08/1995 |
| Babylon 5 All Alone in the Night Lennier | 02/15/1995 |
| Babylon 5 Acts of Sacrifice Lennier | 02/22/1995 |
| Babylon 5 Hunter, Prey Lennier | 03/01/1995 |
| Babylon 5 There All the Honor Lies Lennier | 04/26/1995 |
| Babylon 5 And Now for a Word Lennier | 05/03/1995 |
| Babylon 5 In the Shadow of Z'ha'dum Lennier | 05/10/1995 |
| Babylon 5 Knives Lennier | 05/17/1995 |
| Babylon 5 Confessions and Lamentations Lennier | 05/24/1995 |
| Babylon 5 Matters of Honor Lennier | 11/06/1995 |
| Babylon 5 Convictions Lennier | 11/13/1995 |
| Babylon 5 A Day in the Strife Lennier | 11/20/1995 |
| Babylon 5 Passing Through Gethsemane Lennier | 11/27/1995 |
| Babylon 5 Voices of Authority Lennier | 01/29/1996 |
| Babylon 5 Dust to Dust Lennier | 02/05/1996 |
| Babylon 5 Exogenesis Lennier | 02/12/1996 |
| Babylon 5 Messages from Earth Lennier | 02/19/1996 |
| Babylon 5 Point of No Return Lennier | 02/26/1996 |
| Babylon 5 Severed Dreams Lennier | 04/01/1996 |
| Babylon 5 Ceremonies of Light and Dark Lennier | 04/08/1996 |
| Babylon 5 Sic Transit Vir Lennier | 04/15/1996 |
| Babylon 5 A Late Delivery from Avalon Lennier | 04/22/1996 |
| Babylon 5 Ship of Tears Lennier | 04/29/1996 |
| Babylon 5 Interludes and Examinations Lennier | 05/06/1996 |
| Babylon 5 The Hour of the Wolf Lennier | 11/04/1996 |
| Babylon 5 Whatever Happened to Mr. Garibaldi? Lennier | 11/11/1996 |
| Babylon 5 The Summoning Lennier | 11/18/1996 |
| Babylon 5 Falling Toward Apotheosis Lennier | 11/25/1996 |
| Babylon 5 The Long Night Lennier | 01/27/1997 |
| Babylon 5 Into the Fire Lennier | 02/03/1997 |
| Babylon 5 The Illusion of Truth Lennier | 02/17/1997 |
| Babylon 5 Atonement Lennier | 02/24/1997 |
| Babylon 5 Racing Mars Lennier | 04/21/1997 |
| Babylon 5 Lines of Communication Lennier | 04/28/1997 |
| Babylon 5 Conflicts of Interest Lennier | 05/05/1997 |
| Babylon 5 Rumors, Bargains and Lies Lennier | 05/12/1997 |
| Babylon 5 Moments of Transition Lennier | 05/19/1997 |
| Babylon 5 No Surrender, No Retreat Lennier | 05/26/1997 |
| Babylon 5 The Face of the Enemy Lennier | 06/09/1997 |
| Babylon 5 Intersections in Real Time Lennier | 06/16/1997 |
| Babylon 5 Between the Darkness and the Light Lennier | 10/06/1997 |
| Babylon 5 Endgame Lennier | 10/13/1997 |
| Babylon 5 Rising Star Lennier | 10/20/1997 |
| Babylon 5 The Deconstruction of Falling Stars Lennier | 10/27/1997 |
| Babylon 5 No Compromises Lennier | 01/21/1998 |
| Babylon 5 The Very Long Night of Londo Mollari Lennier | 01/28/1998 |
| Babylon 5 The Paragon of Animals Lennier | 02/04/1998 |
| Babylon 5 A View from the Gallery Lennier | 02/11/1998 |
| Babylon 5 Learning Curve Lennier | 02/18/1998 |
| Babylon 5 Strange Relations Lennier | 02/25/1998 |
| Babylon 5 Secrets of the Soul Lennier | 03/04/1998 |
| Babylon 5 Day of the Dead Lennier | 03/11/1998 |
| Babylon 5 In the Kingdom of the Blind Lennier | 03/18/1998 |
| Babylon 5 A Tragedy of Telepaths Lennier | 03/25/1998 |
| Babylon 5 Phoenix Rising Lennier | 04/01/1998 |
| Babylon 5 The Ragged Edge Lennier | 04/08/1998 |
| Babylon 5 The Corps Is Mother, the Corps Is Father Lennier | 04/15/1998 |
| Babylon 5 Meditations on the Abyss Lennier | 05/27/1998 |
| Babylon 5 Darkness Ascending Lennier | 06/03/1998 |
| Babylon 5 And All My Dreams, Torn Asunder Lennier | 06/10/1998 |
| Babylon 5 Movements of Fire and Shadow Lennier | 06/17/1998 |
| Babylon 5 The Fall of Centauri Prime Lennier | 10/28/1998 |
| Babylon 5 The Wheel of Fire Lennier | 11/04/1998 |
| Babylon 5 Objects in Motion Lennier | 11/11/1998 |
| Babylon 5 Objects at Rest Lennier | 11/18/1998 |
| Star Trek: Deep Space Nine The Siege of AR-558 Kellin | 11/18/1998 |
| Babylon 5 Sleeping in Light Lennier | 11/25/1998 |
 | What's New, Scooby-Doo? Toy Scary Boo Harry Noze | 02/01/2003 |
 | Lost in Space Impact Real Dr. Smith | 04/13/2018 |