During WWII, industrialist Joe Keller commits a crime and frames his business partner Herbert Deever. Years later, his sin comes back to haunt him when his son plans to marry Deever's daughter.

A veteran, Joe Hilton, returns from the war to find that his brother Jeffrey Hilton, a gangster, has been killed. His quest for revenge leads him to take over his brother's illegal operations but his sweetheart, Lynn Turner, persuades him to change his ways and return to the straight and narrow.

The Invisible Man's grandson uses his secret formula to spy on Nazi Germany.

A high priest of Karnak travels to America with the living mummy Kharis (Lon Chaney Jr.) to kill all those who had desecrated the tomb of the Egyptian princess Ananka thirty years earlier.

Slip (Leo Gorcey), Sach (Huntz Hall), Bobby (Bobby Jordan), Whitey (William Benedict) and Chuck (David Gorcey) 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 (Bernard Gorcey) Malt Shop. Sidewalk photographer Cathy Smith (Teala Loring) 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.

An innocent dancer is accused of murder after his shoe prints are found at the scene, but his wife follows the trail of clues to find the real perpetrator.

Slip and Sach are working as cleaners in a high rise building. They enter an office to clean it when a messenger hears them use Slip's given name, Terrance Mahoney. The messenger has a letter for "Terrance Mahonoey, Esq." and mistakenly delivers it to Slip. The letter informs Slip that he has inherited a mansion in Long Island. The boys then make their way to the mansion and find that it is inhabited by diamond smugglers. The real owner of the house shows up and helps save the day and defeat the smugglers and gives the boys the house as a reward.

Skipper Murphy is serving as trainer and inspiration for his brother Red Murphy training for a world championship title bout. Trouble comes for the Murphys when Red runs up against a gambling syndicate and is put on the spot to throw the fight.

A university chemistry professor experiments with an ancient Mayan gas on a medical student, turning the would-be surgeon into a murdering ghoul as part of a plan to steal his lover.

A greedy woman betrays her jewel thief husband to the police, for the reward. Her husband's friend, a detective, adopts the couple's child and raises her as his own. Eighteen years later the husband, still in prison, finds out that his ex-wife is now blackmailing their daughter. He vows to break out and put a stop to her once and for all.