Mumbly investigates a disturbance at Dr. Seek’s lab where he discovers Dr. Seek’s new soda formula turns him into the insidious Mr. Hyde.
Aliens arrive to invade Earth, and Shnooker tasks Mumbly with giving them a parking ticket and collecting the fine.
Mumbly and Shnooker want to see the launch of a rocket going to Mars. However, two criminals named Hemlock and Alfie are after them.
Shnooker’s ski vacation is spoiled by the sudden appearance of a creature scaring everyone away from the lodge.
Fatbeard the pirate invades a cruise ship, causing havoc. Mumbly is sent to capture and remove him.
The Purple Baron, a pilot who flies a biplane, has frozen all of the people in Mumbly and Shnooker's city by using his immobiliser beam! Mumbly was not affected by the beam, and he notices that no one is moving when driving to the police headquarters. Shnooker is frozen, but he left a message for Mumbly on a tape recorder. Shnooker tells Mumbly that Purple Baron shoplifts and robs people of their money while they are immobilized, and the dog detective has to stop him.
Shnooker’s TV interview is interrupted by a sudden deluge of litter, courtesy of The Littermugg. Chief Shnooker alerts the sanitation department, but even they are helpless to keep up with the numerous amounts of garbage left by Mr. Littermugg, so he assigns Mumbly to the case, giving him 24 hours to do so.
A prize-winning bull is taken, setting Mumbly on the trail of The Lonesome Rustler.
Graffooey the Great Graffiti Artist is covering Mumbly and Shnooker's city with graffiti! The detectives have to stop Graffooey before he causes even more damage to their city.
Mumbly and Shnooker take a trip to Canada just as a giant lumberjack is terrorizing the forest.
Shnooker hires a robot detective named Lieutenant Nuts and Bolts. Mumbly and Nuts and Bolts have to stop a cat burglar known as The Phantom Cat from robbing a safe. Shnooker tells them that the first detective to arrest the cat burglar will keep their job, and the other detective will lose their job.
Mumbly is tasked with ending the rampage of an 80-foot gorilla in the city.
At Crabstone Prison every precaution has been taken to make it escape proof. But Breakout Barney stows away inside a trash can the guards put out, and proceeds to head to the border. Shnooker orders Mumbly to bring in Breakout Barney in 24 hours or "turn in your badge!"
Mumbly and Shnooker are assigned to guard people and their valuables at a mansion, where a magician named The Great Merlini is performing. Shnooker thinks that it is an easy job, but Mumbly is suspicious of Merlini.
Mumbly is assigned to retrieve a new top-secret police vehicle that ends up being stolen.
Shnooker receives a letter from a thief named Fleetfeet Fogarty. Fleetfeet plans to steal the Minerva Medallion in a museum. Shnooker tells Mumbly to arrest the thief.
