From Wikipedia, the free encyclopedia. AIra Stadlen (January 16, 1924 – April 18, 2010), known professionally as Allen Swift, was an American voice actor, known for playing characters including Simon Bar Sinister and Riff-Raff on the Underdog cartoon show. He provided the voices of many of the characters in The Bluffers, most of the voices for the 1960s underwater puppet show Diver Dan, and the voices in Gene Deitch's 1960–1962 group of Tom and Jerry cartoons. Swift was a children's television show host on WPIX in