In this spoof of McCarthy-era paranoia and 1950s wholesomeness, the characters and plot are drawn from the popular Parker Brothers board game of the same name. On a dark and stormy night in 1954, six individuals with ties to Washington are assembled for a dinner party at the swanky mansion of one Mr. Boddy (Lee Ving). Boddy's butler, Wadsworth (Tim Curry), assigns each guest a colorful name: Mr. Green (Michael McKean), Col. Mustard (Martin Mull), Mrs. Peacock (Eileen Brennan), Professor Plum (Christopher Lloyd), Miss Scarlet (Lesley Ann Warren), and Mrs. White (Madeline Kahn). Two additional servants, the Cook (Kellye Nakahara) and Yvette, the maid (Colleen Camp), assist Wadsworth as he informs the guests that they have been gathered to meet the man who has been blackmailing them: Mr. Boddy. When Boddy turns up dead, however, the guests must try to figure out who killed him so they can protect their own reputations and keep the body count from growing.