Rosie and Ace become blues-singing hoboes when the newly-elected Mayor Vile strips them of their dog licenses.

Eliot shows Artie that learning can be fun after Terri voices her concern over Artie's poor math grade. Meanwhile, Ace Hart tries to solve a case involving Bernie, the big pink star of the wildly popular kiddy show and discovers it's the Vile gang. We also meet Bugsy vile in "His Master's Choice Theater" as he reads to us a twisted version of Aesop's fable. We also learn about proper puppy behavior in "Good Doggie, Bad Doggie, " where Ace Hart & Mad Dog demonstrate the fine points of puppy etiquette. And finally Mr. Moogie learns about math by diving into a blackboard and tackling multiplication.

Eliot and Artie help each other overcome their fear of the future. While Ace and Eddie chase Rottweilers most recently commissioned world domination device -- a doggie door time portal machine. Yves la Chance's ancestor carries on the family name as the greatest cat burglar in the cosmos - but Stevens great great grandson hasn't changed a bit. He still dresses in the same uniform and still foils Yves attempts at every comic turn. Rosie and Dot take a trip to a futuristic amusement park where Rosie demonstrates to Dot, with the help of the Vile gang, how crime will be cleaned up in the future.

It's the summer and everyone is excited, about to disperse on their vacations. Eliot however is stuck behind doing a show so he sends Ace and Rosie on a vacation, accompanied by Eddie and Dot.