Slip and Sach's boss, David J. Thurston, has allegedly committed suicide. Slip finds a book of matches with the name of a local nightclub on his boss' desk and finds out from Gabe that a gambling casino is being run out of it. Slip comes to the conclusion that the club had something to do with his boss' death and sets out to find his murderer. The boys get jobs at the club and Louie poses as a rich cattlemen as they gather the information to convict the murderers.
When Sach eats too much sugar, he goes into a trance whereby he's able to predict the future. Slip tries to make some money off of Sach by using him as a fortune teller in a carnival, until a mad scientist kidnaps Sach to use him in an intelligence-switching experiment with a monster.
Sach and the gang (Bowery Boys) find stashed cash in an old farmhouse apparently haunted.
While Louie is on vacation, the boys turn The Sweet Shop into an escort service, and soon find a group of beautiful girls as their first clients.
The boys are working at the local boxing arena where their friend, Jimmy Higgins, is boxing. During a crooked match Jimmy is killed. The boys seek out his older brother, Johnny, a former boxer who gave up the sport rather than go crooked, and help train him to get back in the ring. They try to get him a shot at the title, and when they do the same crooked gangsters that were behind Jimmy's death try to get Johnny to take a dive.
When a cold medicine causes Sach to be able to smell diamonds, he and the rest of the Bowery Boys are induced by a diamond dealer to accompany him to Darkest Africa in search of a legendary cache of them.
Slip, Sach and the gang (Bowery Boys) think an air-raid test is for real and join the Army.
Sach is given a post-hypnotic suggestion that turns him into a championship prizefighter.
Slip and the gang (Bowery Boys) foil foes of the exiled, incognito king of Truania (Sig Ruman).
Sach and the gang baby-sit a bratty TV star.
Slip and Sach (Bowery Boys) go to prison to help a reporter with a story.
Slip and Sach are in the sidewalk star-gazing business when they see a murder committed in a room at the El Royale Hotel.
After being punched in the nose, Sach finds out that he has the ability to read minds. Slip and the gang start up a detective agency try to cash in on Sach's new powers.
Sach learns that he has inherited a farm in rural hillbilly country, and when he and the Boys arrive there, they find themselves mixed up with a hillbilly clan named Smith who'll shoot anybody named Jones, plus a gang of bank robbers.
A ghost helps the Bowery Boys capture a gang of crooks led by a mad doctor.
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 gets fired from his job at a construction company for decking his boss. His sister, who got him a job at the company, is angry with him. Slip manages to get a job with the District Attorney serving warrants, as does Sach. Through his job, Slip finds out that all is not quite kosher at his old construction company, and that his sister may be in danger.
Slip and Sach take the rap for a robbery they did not commit in order to uncover the real robbers, whom they suspect are led by a convict who gives orders to his gang outside via a short-wave radio stashed somewhere in the prison.
Slip and correspondence school pilot Sach, go to an air base to help a pal out...but find themselves in when they mistakenly sign enlistment forms. Can the Air Force turn these dodos into eagles? The guys may be airborne airheads, But just watch them find a way to ground a spy network that's infiltrated the base.
Sach receives news that he is the heir to the Terwilliger Debussy Jones fortune. Accompanied by his pal Slip, he arrives at the Jones mansion to review the legal papers needed for him to claim his new fortune. However, Sach and Slip discover that the rightful heir, the young Terwilliger III, is being cheated out his inheritance by the miscreant duo of Stuyvesant Jones and Clarissa. Sach and Slip, with the help of their fellow Bowery Boys, save the day and restore the heir’s inheritance.