What is the name of the character played by Peter Sellers in the movie that inspired Mastermind?
Mastermind (film):  The second of producer Malcolm Stuart's two-picture deal with screenwriter, William Peter Blatty, the project was inspired by the success of the 1964 Peter Sellers comedy, A Shot in the Dark which Blatty had co-written with producer/director Blake Edwards. A Shot in the Dark (1964 film):  Peter Sellers is featured again as Inspector Jacques Clouseau of the French Sûreté.
Inspector Jacques Clouseau