The Stooges accidently become accomplices to a spy smuggling microfilm out of the United States in watermelons.
Plumber Stooges are called to a society party to fix a leak and wind up battling art thieves.
When the evil Emir of Schnow steals the famous Rootintootin diamond, the Stooges decide to find it and collect the large reward.
Foreign spies mistake Larry, Moe, and Shemp for the famous Professor Sneed and his team and abduct them. The agents take them back to their homeland to make rocket fuel for the military.
The Stooges take care of their downstairs neighbor Mary, who pretends to be an invalid to collect an insurance payoff. The Stooges notice an ad for Svengarlic the hypnotist, and think he may be just the man to treat Mary.
Councilman John Goodrich is targeted by the Phantom Gang and calls the Alert Detective Agency for help. The agency sends the Stooges, who blunder through Goodrich's home and become targets for the gang themselves.
The Stooges are asked to remove an antique suit of armor from a haunted castle.