2007
The Pixar Story as Manny (voice) (archive footage)2001
Hubert's Brain as The Professor (voice)2000
Buzz Lightyear of Star Command as Era (voice)2000
Al Lewis: Forever Grandpa as Dr. Zachary Smith (archive footage)1999
Toy Story 2 as The Cleaner (voice)1998
Toonsylvania as Not available1998
A Bug's Life as Manny (voice)1998
Lost In Space Forever as Self (also archive footage)1997
The Angry Beavers as Not available1997
Channel Umptee-3 as Stickley Rickets (voice)1996
Superman: The Animated Series as Julian Frey (voice)1995
Freakazoid! as Professor Jones (voice)1994
Spider-Man as Miles Warren / The Professor (voice)1993
Problem Child as (voice)1991
Darkwing Duck as Phineas Sharp (voice)1990
The Adventures of Don Coyote and Sancho Panda as Not available1989
Happily Ever After as Sunflower (voice)1987
Visionaries: Knights of the Magical Light as Not available1987
Pinocchio and the Emperor of the Night as Grumblebee (voice)1986
Witches, Warlocks & Wizards as Host1985
Rainbow Brite and the Star Stealer as Count Blogg (voice)1979
Sweepstakes as Not available1978
Vega$ as Not available1978
Battlestar Galactica as Lucifer (voice) (uncredited)1978
Battlestar Galactica as Lucifer1978
Battlestar Galactica as Lucifer (voice)1978
Escapade as Oz (uncredited) (voice)1978
Last of the Good Guys as Dr. Cropotkin1977
Space Academy as Not available1976
Monster Squad as The Astrologer1976
Ark II as Fagon1973
My Favorite Martians as Uncle Martin (voice)1973
Lost in Space as Dr. Zachary Smith1972
Sanford and Son as Not available1971
Funny Face as Not available1971
Once Upon a Dead Man as Mr. Wortzel1970
Night Gallery as Prof. Nicholas Porteus1969
Love, American Style as Hollister1969
Love, American Style as Mr. Benjamin1968
Lancer as Not available1968
Land of the Giants as Mr. Piper1968
The Three Musketeers as Not available1968
The Three Musketeers as Athos1965
Get Smart as The Ambassador1965
Lost in Space as Dr. Zachary Smith1964
Bewitched as Not available1964
The Rogues as Paul Duval1963
The Bill Dana Show as Not available1960
Outlaws as Not available1959
Bonanza as Charles Dickens1959
The Twilight Zone as George Alfred1959
The Twilight Zone as Doctor1959
The Third Man as Not available1959
The Big Fisherman as Lysias1958
Shirley Temple's Storybook as Lord Karsch1957
Zorro as Not available1956
Telephone Time as Not available1954
Climax! as Fritz Weiser1953
General Electric Theater as Hong Kong Sam1953
General Electric Theater as Favier1953
General Electric Theater as Fouresh1953
General Electric Theater as Trapollini1952
The Adventures of Ozzie and Harriet as Farnsworth1952
Omnibus as Not available1952
Omnibus as Courcelles1952
Omnibus as Matey1952
Botany Bay as Tom Oakly1951
Hallmark Hall of Fame as Legendre1951
Hallmark Hall of Fame as Exton1951
Schlitz Playhouse of Stars as Popeau1949
Lights Out as Not available1948
Studio One as Mr. Dickinson1948
Studio One as Master of Ceremonies1948
Studio One as Dr. Wetheril