2021
The Center Seat: 55 Years of Star Trek as Self (archive footage)2018
Clark Ashton Smith: The Emperor of Dreams as Himself2010
Scooby-Doo! Mystery Incorporated as Self (voice)2008
Dreams with Sharp Teeth as himself2007
To My Great Chagrin: The Unbelievable Story of Brother Theodore as Himself2006
40 Years of Star Trek as Self2005
Shadows in the Dark: The Val Lewton Legacy as Self2005
Legends of the Dark Knight: The History of Batman as Himself2003
Impressions of Dune as Self1996
Psi Factor: Chronicles of the Paranormal as Not available1994
Babylon 5 as Sparky the Computer (voice)1994
Babylon 5 as Psi Cop1994
Babylon 5 as Zooty (voice)1994
Phantom 2040 as Not available1993
The Overstreet World of Comic Books as Self1989
The Simpsons as Harlan Ellison (voice)1989
Prisoners of Gravity as Self1987
The Masters of Comic Book Art as Self - Host1981
Television: The Enchanted Mirror as Self1971
The Godson as Guy with Barbara and Brunette (uncredited)2023
Ant-Man and the Wasp: Quantumania Thanks2019
Love, Death & Robots Short Story2007
Masters of Science Fiction Writer1997
The Hunger Writer1997
The Hunger Story1995
The Outer Limits Short Story1994
Babylon 5 Writer1993
Cadillacs and Dinosaurs Story1985
The Twilight Zone Writer1985
The Twilight Zone Creative Consultant1985
The Twilight Zone Story1984
The Terminator Thanks1984
Tales from the Darkside Writer1980
The Starlost: The Beginning Writer1975
A Boy and His Dog Novel1973
The Starlost Writer1973
The Starlost Creator1973
The Starlost Creator1972
Ghost Story Story1966
The Oscar Screenplay1966
Star Trek Writer1966
Tales to Keep You Awake Writer1964
The Man from U.N.C.L.E. Writer1964
Voyage to the Bottom of the Sea Writer1963
Burke's Law Writer1963
The Outer Limits Writer1962
The Alfred Hitchcock Hour Writer