Psych S01 E08 Shawn vs. the Red Phantom

"Fake psychic. Real detectives."

Gus is ecstatic when it turns out the only real clue in his and Shawn's missing-person case is TriCon, the comic book and science fiction convention currently running in Santa Barbara. As bodies start turning up, they must balance their newly-scammed and increasingly onerous duties as George Takei's assistants with finding the killer and saving the teenager.