The Fiendish Plot of Dr. Fu Manchu is a 1980 comedy film, notable as the final film of Peter Sellers, David Tomlinson and John Le Mesurier. Preproduction began with Richard Quine as director. By the time the film entered production, Piers Haggard had replaced him. Peter Sellers handled the reshoots himself. Based on characters created by Sax Rohmer, the film stars Sellers in the dual role of Fu Manchu, a stereotypical Chinese evil genius, and English country gentleman detective Nayland Smith he also appears in an uncredited cameo as a Mexican bandito. Released less than a month after his death and despite it being the last film Sellers appeared in while he was alive, the film was a commercial and critical failure. It was also the final film appearance for Tomlinson, who retired shortly before its release and died in 2000.
In addition to Sellers, the film features Sid Caesar as FBI agent Joe Capone, David Tomlinson as Scotland Yard Commissioner Sir Roger Avery, Simon Williams as his bumbling nephew and Helen Mirren as Police Constable Helen Rage her performance is notable for her singing the Music Hall standard, Daddy Wouldnt Buy Me a Bow Wow.Burt Kwouk, Sellers longtime costar in The Pink Panther films, makes a cameo appearance as a Fu Manchu minion who accidentally destroys the elixir vita, prompting the inside joke that Fu thinks he looks familiar possibly a veiled reference to Kwouks two uncredited appearances in the Fu Manchu films of Christopher Lee. John Le Mesurier has a small part in the film as NaylandSmiths butler. ........
Source: Wikipedia