Ben Taggart

Hard Guy -- Vic (Jack La Rue) is a night club owner/racketeer whose club is run primarily for the purpose of the club girls marrying the rich bluebloods among the customers, leading to annulments leading to cash settlements and/or blackmail.

Penny Serenade -- YouTube - Full movie (Flash)

The Durango Kid is a sort of Robin Hood of the West who helps the lovely Walters (who replaced Starrett's usual love-interest, Iris Meredith), the daughter of a homesteader, defeat the evil MacDonald who has been terrorizing the decent citizens with his gang of rustlers.

Stars Boris Karloff as a kindly doctor whose noble experiments go awry, causing much death and despair. In this outing, the elderly Dr. Garth (Karloff) searches for a cure for mortality via plasma injections. Sentenced to death for a mercy killing, Garth is allowed to continue his experiments in prison.