With credits on more than 300 film and TV programs, Paul Frees was the embodiment of the highly successful voiceover artist. Not surprisingly, Frees began his career in the world of radio, where he delighted listeners and show producers with his talented vocal impersonations. He began to work in film in the early 1940s. Often he served as a narrator, but was sometimes called to replace the voices of actors. In "The Ugly Dachshund" (1966), he replaced a performer who died. He later dubbed the voice of Japanese star Toshirô Mifune in "Grand Prix" (1966). But Frees was most famous for voicing many of the beloved cartoon characters of the 1960s and '70s. He played Boris Badenov in the animated "Rocky and His Friends," Inspector Fenwick in "The Dudley Do-Right Show," and a panoply of voices in the stop-motion animated Christmas specials of Jules Bass and Arthur Rankin, Jr. ("Rudolph's Shiny New Year," "Santa Claus Is Comin' to Town"). More obscurely, Frees was K.I.T.T.'s four-wheeled nemesis, K.A.R.R., in the 1980s David Hasselhoff series "Knight Rider."