The Bowery Boys--Slip, Sach, Bobby, Whitey & Chuck--start their own exterminating service, and get a job which takes them to a spooky old abandoned mansion in the middle of the night. Meeting up with pal Gabe and his new French bride, the boys are tormented by mad scientists who try to convince them the place is haunted and then kidnap Sach in order to place his brain inside a gorilla.
In 19th Century Paris, a maniac abducts young women and injects them with ape blood in an attempt to prove ape-human kinship but constantly meets failure as the abducted women die.
This story revolves around an old man who feels alone in the world aside from the gang who keeps him company and his old horse. He runs a horse and buggy business, but he has new competition: an auto taxi. The gang helps him to maintain his job by sabotaging the other man's.
The original film featured the then unknown Rudolph Valentino. To cash in on his rise to stardom, it was re-edited to feature more of him. Various shots were repeated several times; long shots were blown up into close-ups and inter-cut with other footage; some scenes were projected on a loop, so that Rudolph Valentino repeated the same motions several times over; one scene was used as a flashback; and out-takes from the original were inserted into the new film. In addition, the locale of the new picture was switched from World War 1 Germany to a desert island by the simple expedient of inserting shots of bathing beauties on a palm-fringed beach throughout the film.
