In Clue, Colonel Mustard (Martin Mull) is a guest of Mr. Boddy’s who’s being blackmailed for war profiteering. It’s revealed that he made his money from selling stolen radios on the black market, as well as having an affair with one of Miss Scarlet’s escorts. In one of the endings, he killed a stranded motorist in the lounge with a wrench.

Yvette (Colleen Camp) is Mr. Boddy’s maid in the film, Clue. She is also Mr. Boddy’s accomplice, a former escort for Miss Scarlet, where she had Colonel Mustard as a client, and one of Miss Scarlet, Mrs. Peacock, or Mrs. White, depending on the ending.

Dr. Emmett Lathrop “Doc” Brown, Ph.D., played by Christopher Lloyd, is best friends with Marty McFly in the Back to the Future series. Brilliant but absentminded, he invents a time machine using a DeLorean, a flux capacitor, and plutonium stolen from Libyan terrorists. Great Scott!

In Clue, Mrs. White (Madeline Kahn) is a “black widow” who had her husbands disappear or die mysteriously. She is a guest of Mr. Boddy’s, and is also being blackmailed by him. The maid had an affair with one of her husbands, so in one of the endings, she killed the maid in the billiard room with a rope.

Miss Scarlet (Lesley Ann Warren) is a character from the board game, Clue. In the film adaptation, she is a socialite who runs an illegal escort service, for which she is being blackmailed by Mr. Boddy. In one of the ends, she killed the cop in the library with a lead pipe.

In Clue, the Singing Telegram Girl (Jane Wiedlin) is a character who visits Mr. Boddy’s party to deliver a message, before being killed by one of the guests. She is later revealed to be a former patient and lover of Professor Plum’s.