Best known for his role as the 'Pink Panther'; this was Peter Sellers last film. Sellers plays two roles - the evil Fu Manchu and his nemesis, Scotland Yard's Nayland Smith. Manchu is celebrating his 168th birthday when one of his assistants spills the last of his anti-aging potion. He sends his assistants out to gather the materials needed to make more potion - including the Star of Leningrad Diamond. This alerts the authorities who set up a plan to get Manchu to kidnap a decoy Queen of England.