Psych 9 p.m. Wednesday, USA The always amusing "Psych" celebrates its 100th episode Wednesday with an elaborate, hilarious homage to the cult movie comedy "Clue." The episode features that film's actors Christopher Lloyd, Lesley Ann Warren and Martin Mull, along with guest appearances from Garrett Morris and Curt Smith of Tears For Fears. The show has always stepped up it cleverness when playing off a pop culture phenomenon--most recently its homage to "The Blair Witch Project" called "Lassie Jerky." In Wednesday's episode, Shawn (James Roday) and Gus (Dule Hill) try to solve a murder at a party hosted by an old rock star in a California mansion. Five suspects--the groupie, the manager, the author, the host and the butler--are narrowed down to three before viewers will be given the chance to vote on social media for who they want to have committed the crime. Three endings were filmed, each lasting three minutes, and the top vote-getter will be used. Pictured, left to right: Dule Hill, Garrett Morris, James Roday, Timothy Omundson, Maggie Lawson, Lesley Ann Warren, Christopher Lloyd, Steve Valentine.