- He provided additional vocals for the song "The Mystery Men Mantra" which is featured on the Mystery Men (1999) soundtrack.
- TV Commercial for 7-Up (1999)
- TV Commercial for Jell-O (1981)
- Appears in the live theatre talk show "The J. Keith van Straaten Show" in Los Angeles.
- Infomercial for X3D Viewing System (2002)
- Autobiography "Just A Geek" (2004)
- Appeared in the music video of Ben E. King's song 'Stand By Me'
- Novel "Dancing Barefoot" (2003)
- Appeared, wearing Acting Ensign Crusher attire, with the "Pigs in Space" crew, in Fall issue of Muppet Magazine (1987)
- (2012) "Leverage" - The Last Dam Job - TV playing Chaos!
- (2010) "Leverage: The Ho Ho Ho Job (#3.14)" - TV playing Chaos!
- (2009) "Leverage: The Two Live Crew Job (#2.7)" - TV playing Chaos!
- (2009 - 2015) Plays himself in the television series The Big Bang Theory, where he is the nemesis one of the main characters, the social clumsy 'Trekkie' Sheldon Cooper.
- (January 1, 2020) Narrated novel The Martian, authored by Andy Weir and published by Audible Books.
- (10.8.24) Narrated the "Ready Player One" audio book.
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