McCool's idyll on a tropic island with a mermaid is interrupted by a telephone call from Number One; a steamroller breaks the bike of Harry McCool and the Komedy Kops; Number One has the night off and assigns McCool to guard the office.
The Owl leads a flock of birds to a daring bank robbery; Harry McCool and the Komedy Kops arrest Gaston Gaswell for selling balloons without a license; Jack-in-the-Box escapes from prison and commits a series of daring robberies.
Hurricane Harry discovers that he is the exact double of the Maharajah of Mish Mash, who is scheduled to be given his weight in diamonds; Harry McCool and the Komedy Kops pass a man with his arms full of candy apples.
Dr. Madcap and Greta Ghoul rob the Potts Gold Co. and escape to Mexico; Number One and McCool look at the latest pictures of the moon and discover that the Owl is there with the loot from his latest caper.
Dr. Madcap creates a hat that turns the wearer into a mindless fool; the Sarge orders Harry McCool and the Komedy Kops to whitewash the jail house; the Rattler steals a truth-telling machine and robs eight banks.
Hurricane Harry puts the world asleep by blowing sleepy smoke from a pot on his island; while Harry McCool and the Komedy Kops are arguing about who should get the back seat of their tandem bicycle, a crook gets away right under their noses.
Dr. Madcap, using a gigantic hat, lifts an armored car with a zillion dollars in gold; the radio reports that Woodchopper has downed six sycamores on Cedar Street; the Rattler kidnaps Professor B. Fuddled and steals his shrinking formula.