Starting on April 20, 2010, Thompson voiced Ferguson's robot skeleton sidekick Geoff Peterson, originally using pre-recorded clips of various reactions to the host's cues. Thompson tweeted his "recipe" for Geoff's voice in September: "1 part Snagglepuss. 1 part Vincent Price. 2 parts George Takei." On May 16, 2011, Thompson performed Geoff as a show guest; in a later skit spoofing the show's opening broadcast, Thompson portrayed Peterson as a living sidekick who suggested that Ferguson could reanimate his skeleton should something befall him while skydiving. Beginning June 29, 2011, Thompson voiced and performed Geoff live for nearly every episode, both in-studio and in such locations as Paris, France.