Well before he was cast in Hanna-Barbera's Shazzan in 1967, Barney Phillips was a modestly successful character actor who co-starred for one season on Dragnet as Officer Ed Jacobs, opposite Jack Webb as Joe Friday. The timbre of his voice might not be the same, suggesting that he went to a deeper, basso profundo for Shazzan. Here, from 1952, is the Dragnet episode, "The Big Cast", with special guest Lee Marvin. Pay close attention when Phillips speaks.
The video is also on my other blog, The Land of Whatever.