Professor Balls is a supporting ally to Clouseau, appearing in "Revenge of the Pink Panther", "Trail of the Pink Panther", "Curse of the Pink Panther" and "Son of the Pink Panther". He is played by Graham Stark, who played numerous characters in the films, in "Revenge" and "Son", and Harvey Korman in "Trail" and "Curse".
Balls is Clouseau's eccentric Italian disguisemaker. He is flamboyant and dramatic, and always has Italian opera playing in his disguise shop. Clouseau is his favourite and most loyal customer. Balls' catchphrase and motto is "When duty calls, look no further, you've got Balls!" He is assited by his sidekick, Cunny.
In "Revenge of the Pink Panther", Clouseau visits Balls' shop, where he is assisted by Balls and Cunny. While he is there, the French Connection Mafia guys plant a bomb outside intended to kill him, which he picks up, before realizing what it is, and throwing it into the back of the shop, damaging the shop and wounding Balls and Cunny. They continue to aid Clouseau throughout the film, wrapped in bandages, and with Balls using Cunny as a chair.
In "Trail of the Pink Panther", in what was originally a deleted scene from "The Pink Panther Strikes Again", hence the fact that Clouseau is buying a disguise he uses in that film, Clouseau visits the shop at the beginning of the film, again being spied on by the French Mafia. Balls introduces Clouseau to his wife, Martha, with whom he communicates using a dusty pipe. Cunny and Balls help Clouseau find a fake nose, but Clouseau mistakes Balls' wife's large nose for a fake one, leading to an awkward situation. Later in the film, when Clouseau dissapears at sea, Balls angrily phones his house and shouts at and insults Cato, his servant; as it turns out, Clouseau is heavily in debt to Balls, who believes the dissapearance is a scam.
In "Curse of the Pink Panther", Balls, Martha and Cunny are visited by Clifton Sleigh on his mission to find Clouseau and the Pink Panther diamond.
In "Son of the Pink Panther", Balls and Martha are hospitable to Clouseau's son, Gambrelli, and are guests at the celebration later on.