Colonel Mustard is a character from the board game, movie, and franchise Clue. He is portrayed by Martin Mull in the 1985 film. Most commonly, Mustard is portrayed as a military officer, often a retired one. What branch of service he was associated with, how legitimate his career was, or how dangerous he is depends on the edition. As of the 2023 edition, he is a respected ex-military man. In the film, he was a war profiteer during the Second World War.