Captain Robert April wrote:
Walker Edmiston was the talent and also provided his voice in "The Corbomite Maneuver" as the voice of Balok, "A Taste of Armageddon" as Eminiar Security voice, "Friday's Child" as voice of SS Dierdre, and "The Gamesters of Triskelion" as Provider #2 voice
Um, Ted Cassidy did the voice of the puppet Balok, while Vic Perrin dubbed Clint Howard's Balok.
Although I had heard that for years, most sources (Memory Alpha, Wikipedia) now agree that it was Edmiston, not Perrin who dubbed the "real" Balok. Before his death Edmiston asserted same.