Tarzan and The Diamond Of Asher 1 of 39. May 14, 1934.Tarzan is mistaken for Brian Gregory by the beautiful Magra. Not all cast members listed below appear in every episode. Carlton KaDell (Tarzan), Ralph Scott (D'Arnot), Karena Shields (Helen Gregory), Jeanette Nolan (Magra), George Turner (Brian Gregory), Cy Kendall (Atan Thome), John McIntire (narrator), Frederick Shields (producer, director), Rob Thompson (producer), Don Wilson (Lal Taask), Victor Rodman (Wolf), Victor Potel (Larson), Fred Harrington (Mitchell). oldtimeradiodvd.om