The stooges are repairmen who get a job fixing the doorbell in large house which is the secret headquarters of some Nazi spies. They manage to ruin most of the house while working on the wiring and then subdue the spies and sink an enemy submarine by remote control.

The stooges are salesman selling a weight reducing machine. They have no luck until they show up at the house of an eccentric inventor where they are hired as caretakers. When the scientist goes to Washington to demonstrate his death-ray machine to the government, the boys are left to guard his house and must contend with enemy spies and a mysterious pie thrower.