Who Done It?

Dagwood enters the Army Reserve and Blondie visits only to discover that he has caused all sorts of problems which lead to numerous conflicts.

Fifteen years after his father's experiments with matter transmission fail, Philippe Delambre and his uncle François attempt to create a matter transmission device on their own. However, their experiments have disastrous results, turning Philippe into a horrible half-man, half-fly creature.

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 stooges are castaways from a garbage scow who land on Dead Man's Island where everyone is living in olden times. To escape from the governor, they disguise Curly as a Maharaja and win permission to journey to their own country to fetch presents. The governor is fooled, but the boys run into more trouble in the den of Black Louie the pirate where Curly is forced into a knife throwing contest with Larry as the target. Things look bad until a mis-thrown knife cuts the rope that holds the chandelier and it crashes down on Black Louie's men. With the pirates defeated, Moe decides to take over as ruler of the island.

The stooges are bumbling electricians who decide to go away for a rest after they are fired for their incompetence. The rest home they choose is run by Dr. Mallard, a quack who gyps the patients for everything they've got. When the boys discover the crooked goings on they escape, but not before Curly accidentally cures another patient who rewards him with a thousand dollars.

The stooges are working as paperhangers in the home of Professor Panzer, a mad scientist looking for a brain to use in his experiments. The professor wants to put a human brain into a gorilla but has trouble finding a brain small enough, which leads him to select Curly as the perfect donor.

The stooges are janitors working in a newspaper office. When an anonymous caller phones in a tip about the theft a famous diamond, the boys decide to become reporters and go after the crooks. They find the crooks, but Shemp accidentally swallows the diamond which was hidden in a bowl of candy. The crooks want to cut the diamond out, but the boys foil them with the help of a friendly gorilla.

The stooges become detectives and go to the aid of girl in the clutches of a mad scientist. The boys arrive at a spooky mansion where the madman is building a mechanical man that needs a human head. After declining the opportunity to supply a stooge-head for the experiment, they find the girl and escape, only to wind up in a car driven by the headless robot.

The stooges are the "Day and Night" plumbers. Called out to a fancy mansion where a society party is going on, they cross the electrical and water systems and generally ruin the place. Despite their incompetent plumbing, they save the day by recovering a painting stolen by a pair of thieves masquerading as party guests.

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.