It is prior to the commencement of World War II, and Japan's fiendish Black Dragon Society is hatching an evil plot with the Nazis. They instruct a brilliant scientist, Dr. Melcher, to travel to Japan on a secret mission. There he operates on six Japanese conspirators, transforming them to resemble six American leaders. The actual leaders are murdered and replaced with their likeness.
A mad doctor (Bela Lugosi) and his helpers (John Carradine, George Zucco) lure girls to his lab for brain work, to help his wife.
The town's leading citizen becomes a homicidal maniac after his wife deserts him.
A scientist keeps his wife young by killing, stealing the bodies of, and taking the gland fluid from virgin brides.
A group of delinquents on their way to summer camp get stuck in a haunted house.
Slim Jim Carey, the leader of a criminal gang, is in reality a nobleman called Lord Talbois, and his daughter is the rightful heir to the family estate. When "Slim Jim"'s gang finds out about this, they conspire to cheat her out of her inheritance by passing off one of the gangster's girlfriends as the real daughter. Unbeknownst to the gang, however, their leader isn't dead and finds out what they're up to. Complications ensue.
After the death of her brother, "Tommy" Carlton makes the acquaintance of a neighbor, Harold Graypon, who invites her to a party. Tommy, who is a bit of a hoyden, attends the party in overalls and shocks the guests. Tommy is later ejected from her home and takes refuge in a shack in the mountains, where she makes rustic furniture for a living. Despite the interference of Grace, Tommy and Harold finds happiness with each other.
Former Coastguardsmen Jim Benson is about to lose his boat when a couple approaches him for a fishing charter. Jim departs just ahead of the Sherrif with drunken Shanks, and his companion Sally (Gates). Shanks takes off into a small Mexican village after a fight with Jim, stranding both Sally and him with no money. Two local men hear of Jim's plight, and offer him money to smuggle a batch of illegal aliens, called Wetbacks, into the U.S. He agrees but is blackmailed into continuing to run the smuggling operation. Afraid, Jim decides to make a run for it, but someone close to him reveals themselves as a US Immigration agent and asks him to assist them in shutting down the smugglers for good.
The gang is friend with a millionaire because they saved him from an agression. However, the gang is suspecting that the man's son was actually one of the agressors.
The East Side boxing champion Muggs answers a challenge to a fight against the West Side champ but just before the match he is kidnapped. His friend Danny Lyons takes his place and wins the fight, only to have Mugs believe that Danny was responsible for his kidnapping.
Muggs and Glimpy, two East Side Kids in the army, return to their neighborhood, supposedly on furlough; actually, Muggs has been honorably discharged with a physical defect, but he tells no one of this. Danny, another East Side kid, is in jail because a large amount of medical supplies have been stolen from the warehouse where he works. Muggs see Spider, a new member of the gang, flashing a large amount of money around, and Muggs shrewdly turns toughie, boasting that he has a dishonorable discharge because of thievery. This leads Spider to confide in Muggs that he is the one who has been aiding in the theft of supplies from the warehouse, and he gets paid for the loot by Larry, operator of a nightclub where Muggs' sister, Milly, is an entertainer. Fingers, a henchman for Larry, kills Spider when he learns that Muggs has been let in on the operation. The police then suspect Muggs of killing Spider.
The police commissioner asks some local street kids to toughen up his ballet-loving son.
Muggs' rich Uncle Pete is coming to visit. Unfortunately, Muggs' late father had bragged that he had seven kids, so Muggs recruits the members of the gang to pose as his family. Things turn sour, however, when a local mobster finds out about Muggs' deception and threatens to expose it.
A seemingly charitable soup kitchen operator (who moonlights as a criminology professor) uses his Bowery mission as a front for his criminal gang. Police attempt to close in on the gang as they commit a series of robberies, murders and bizarre experiments on corpses.
Tarzan tries to stop a bloodthirsty Colonel from taking over an African village with his soldiers of fortune. The ape-man has been rendered deaf by an exploding hand grenade, effectively limiting one of his keen senses. Tarzan relies on his telepathic powers to stop a lion. Woody Strode also appears in this film that combines two made for television episodes.
The spiritual leader of an oriental country is dying. The leader's evil brother Khan is plotting to prevent Kashi, the youthful heir, from assuming his rightful position. Tarzan is summoned to protect Kashi and, in doing so, he must face Khan in three tests of strength.
After having been framed by gamblers, Muggs is barred from riding in horse races. Snce he can no longer race, he takes up a collection so Ma Brown, who owns the horses won't have her stable foreclosed on. However, one of the gamblers involved in the frame falls for Ma Brwn's daughter, and decides to come clean and confess to the police about the frame. The other gamblers hear about it and set out to shut him up and discredit Muggs and Ma Brown once and for all.
Tarzan is joined by a reporter and her fiance on a journey to find a boy who was abandoned in the jungle six years earlier. The search party must also battle an evil native, who is out to kill the boy and take over as chief of his brother's tribe.
Danny helps to capture a wanted criminal and receives a $200 reward. However, he has a falling out with the gang when they believe he should share the money with them. Complications ensue when the crook that Danny helped capture escapes from jail and comes looking for him.
Muggs, Glimpy and the rest of the Kids set about to Americanize affable young French refugee Jean Rogers. But after a disastrous baseball game, Jean is chased out of the neighborhood and told not to return.