Ceiling Unlimited: The Rulers of the Earth (aka Dictators Meeting In Hell) (#27) 

Ceiling Unlimited: 5/10/43, episode 27
OTRR version 2409
This episode provided by the Old Time Radio Researchers
A meeting with Phillip II, Napoleon, Louis XIV, Kaiser Wilhem...and the Devil himself (played by Orson) who says, "Hitler serves me very well!" Excellent radio!
Cast: Orson Welles (writer, producer, director, host, performer), George Coulouris, Joseph Kearns, Lou Merrill, Pedro De Cordoba, Hans Conried, Anthony Collins (composer, conductor), Pat McGeehan (announcer), Harry Cronman (writer)