Clive Revill's red hair and distinctive Mr. Punch-like features often saw him cast as comic eccentrics in a number of British films of the 1960s and 1970s such as Kaleidoscope, Modesty Blaise, Fathom, The Assassination Bureau and One of Our Dinosaurs Is Missing. He also had notable supporting turns in Otto Preminger's Bunny Lake Is Missing opposite Laurence Olivier, and his American film debut A Fine Madness, as well as a rare leading role in the horror film The Legend of Hell House.
He was often cast as humorous foreign characters. Two of his highest profile roles of this kind were in two films for Billy Wilder: The Private Life of Sherlock Holmes and Avanti!, for which he was nominated for a Golden Globe Award for his part as put-upon hotel manager Carlo Carlucci.
In the 1978 television miniseries Centennial, he played the Scottish accountant Finlay Perkin. He played both Ko-Ko (the starring role) in The Mikado, and the title character, John Wellington Wells, in The Sorcerer for the Brent Walker television series of Gilbert and Sullivan productions, shown by the BBC in 1983.
After relocating to the United States, he guest-starred in many television series, such as Columbo, Hart to Hart, Dynasty, Magnum, P.I., The Love Boat, Remington Steele, Murder, She Wrote, Babylon 5, The Feather and Father Gang, Newhart, MacGyver, Dear John, The Fall Guy, Maude, and Star Trek: The Next Generation. He starred as the wizard Vector in the short-lived series Wizards and Warriors.
He is also known for his voice work in feature-length films and animated series, which includes Alfred Pennyworth in the first three episodes of Batman: The Animated Series, the voice of Chico in the 7 episodes of Chico the Rainmaker (The Boy with the Two Heads), the voice of Emperor Palpatine/Darth Sidious in the original 1980 version of The Empire Strikes Back, numerous cartoons such as The Transformers, Batman: The Animated Series and DuckTales and more recently video games, including Marvel: Ultimate Alliance and Conquest: Frontier Wars.
-edited from wikipedia.org