Dynomutt, Dog Wonder

Willie the Weasel has created a formula that turns him into Mr. Hyde. While the Blue Falcon and Dynomutt are on the trail of the mysterious Mr. Hyde, they encounter the Mystery, Inc. gang and Scooby-Doo (who are unaware that Mr. Hyde is a supervillain and not one of their typical "spooks"). In The New Scooby-Doo Movies-fashion, they team up with the Blue Falcon and Dynomutt (who happens to be Scooby's hero) to stop Mr. Hyde, who has threatened to turn the population of the entire city into "Mr. Hydes" unless he is proclaimed mayor. Note: This episode is a crossover between Dynomutt, Dog Wonder and Scooby-Doo.

A caveman-like criminal named Lowbrow wants to become the King of Crime and steals some books that will help him in his quest. The Blue Falcon and Dynomutt end up assisted by Mystery, Inc. to stop Lowbrow. Note: This episode is another crossover between Dynomutt, Dog Wonder and Scooby-Doo.

The Gimmick is a criminal mastermind who uses his prowess of gadgets to create havoc in the city and dares the police to stop him from stealing a train car with a prince inside. Note: Mumbly makes a cameo at the end of the episode.

A talking worm called the Worm and his henchman Grub use a digging machine called the Wormborer to spring Bugsy Busby and Roto Chopper from prison in a plot to steal a super-computer.

A fish-themed villain named Fishface plans to steal Big City's oil and hold it for ransom.

Manyfaces uses his talent for disguises to trick Dynomutt into arresting the Blue Falcon, Mayor Gaunt, and the Chief of Police.