Allen Swift
Ira Stadlen , known professionally as Allen Swift, was an American voice actor, known for playing characters including Simon Bar Sinister and RiffRaff 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 Deitchs 19611962 group of Tom and Jerry cartoons. Swift was a childrens television show host on WPIX in New York City as Captain Allen. He took his professional name from radio comedian Fred Allen and 18th century satirist Jonathan Swift.
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Source: Wikipedia