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.