Loose in London

In order to be able to get the names of winning horses at the track, Sach agrees to sell his soul to the devil.

The Bowery Boys head west to clear Louie of an old murder charge that he had killed his gold-mine partner. Sach has the map to the gold mine painted on his back, and Blackjack McCoy has him kidnapped by Indian Joe. Gabe poses as a dangerous gunman, the Klondike Kid, while Slip is in charge of all the remaining loose ends.

Slip invites his cousin Jimmy to stay with his family after he is released from prison. However, Jimmy soon gets mixed up with an auto-theft ring.

Slip, Sach, Bobby, Whitey and Chuck unsuccessfully try to sell a dilapidated car to a street cleaner for a fabulous amount, so they can get enough money to save Louie's Malt Shop. Sidewalk photographer Cathy Smith snaps a pictures of three bank robbers as they are fleeing a robbery but when the Bowery Boys and Cathy realize that Sach is also in the photograph, they break into the photo lab to destroy the negative, which might make the police think Sach was involved in the robbery.

Slip, Sach and the rest of the Bowery Boys enter a haunted house, where they engage in slapstick with a gorilla, a robot and a vampire

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.

A man wins $50,000 in a card game with gamblers, but is soon found dead and the money missing. Slip and Sach find the money near where the body was discovered, and soon find themselves the target of both the police and the gamblers.

Slip and Sach are working for a local newspaper as a reporter and photographer, respectively. Slip wants to get the goods on a local gambling ring that is fixing sporting events, so he and Sach go undercover to expose the ring.

Sach is given a post-hypnotic suggestion that turns him into a championship prizefighter.

A ghost helps the Bowery Boys capture a gang of crooks led by a mad doctor.

The Bowery Boys find a lamp that has strange magic powers.

The Bowery Boys are enrolled in a fancy college by a pair of rich snobs who think they can turn the Boys into classy guys. Sach becomes a football star, and is kidnapped by gangsters to keep him out of the big game.

Sach is the exact double of a famous French scientist who has invented a powerful rocket fuel. Enemy agents, mistaking Sach for the scientist, attempt to kidnap him and get the formula for the fuel.

Slip has entered the Boys' rattletrap car in a souped-up jalopy race, but has no chance of winning until Satch, with the aid of a scientist acquaintance, comes up with a chemical concoction that acts as a super-fuel; but a rival entrant in the race learns of this and tries to get the formula for himself.

The Bowery Boys join the Navy to catch some crooks who are posing as sailors.

The boys buy a uranium mine out west, but when they get there they find that it's pretty much worthless. However, the local badmen are distrustful of these new strangers, and when they mistakenly get the impression that the mine is loaded with uranium, they hatch a scheme to get rid of the boys and take over the mine.