The Olympic Swimmer from Planet Ummo
Michael Rennie (right) goes to work on Paul Naschy in ASSIGNMENT TERROR.
Saw an episode of THE PATTY DUKE SHOW this evening called "The Girl From N.E.P.H.E.W." in which Patty's family play host to a debonair guest who works for INTERPOL, whom Patty assumes to be a secret agent. This fellow was played by an actor named Murray Rose, whose distinctive voice sounded weirdly familiar to me. About halfway through the show, I realized where I'd heard him before....
He dubbed Michael Rennie in the Paul Naschy monster rally ASSIGNMENT TERROR (Los monstruos del terror, 1969)!
Rose's IMDb page doesn't show too many screen credits, but his Wikipedia page offers some interesting revelations about the man whose voice issued commands to the Werewolf, the Mummy and, of course, the Faranksellen Monster. However, it won't tell you anything about his dubbing career.