David Niven portrays Sir Charles Litton, a charming and witty British aristocrat known for his involvement with valuable gemstones.
Robert Wagner plays George Lytton, a suave and smooth-talking American scam artist with a knack for deception.
Herbert Lom embodies Chief Insp. Charles LaRousse Dreyfus, an uptight and easily agitated police inspector.
Joanna Lumley takes on the role of Countess Chandra, a sophisticated and elegant female character involved in the mystery.
Capucine stars as Lady Simone Litton, a glamorous and stylish woman who adds intrigue to the storyline.
Robert Loggia portrays Bruno Langois, a suave and mysterious character with questionable intentions.
Harvey Korman embodies Prof. Auguste Balls, a quirky and eccentric academic figure entangled in the plot.
Burt Kwouk plays Cato Fong, a skilled martial artist and loyal servant to one of the main characters.
Ted Wass takes on the role of Sergeant Clifton Sleigh, a dedicated police officer involved in solving the comedic mystery.
Roger Moore portrays Chief Insp. Jacques Clouseau, a bumbling and accident-prone detective central to the film's storyline.
Leslie Ash stars as Juleta Shane, also known as Julie Morgan, adding a touch of mystery and allure to the movie.
Graham Stark appears as the Bored Waiter, a minor character who contributes to the lighthearted comedy within the film.
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