Frank Conniff is an American writer and actor, best known for his portrayal of TV’s Frank on Mystery Science Theater 3000 (MST3K).
From the second through sixth seasons of Mystery Science Theater 3000‘s time on Comedy Central, Conniff played TV’s Frank, one of the “mads” next to Trace Beaulieu. During his years with MST3K, Conniff was also part of the writing team, and the individual responsible for screening and selecting many of the films shown. After leaving MST3K behind, Conniff went on to become an executive story editor for the popular ABC series Sabrina, the Teenage Witch. He made a few on-air appearances on the show, most notably as “Rootie Kazootie”, a baby-turned-adult due to Sabrina’s wishing spell.
He later showed up as a writer and later as the head writer on the Nickelodeon TV series Invader Zim. In the summer of 2005 Conniff provided the voice for legendary cowboy Buffalo Bill Cody in two episodes of The Radio Adventures of Dr. Floyd. Joel Hodgson announced he was starting a new show with the same “riffing on bad movies” premise as MST3K called Cinematic Titanic, together with former MST3K cast and crew members Conniff, Trace Beaulieu, J. Elvis Weinstein, and Mary Jo Pehl.