Dog Man: The Canine Crusader

Dog Man: The Canine Crusader was one of the comics that flew everywhere when the Turbo Toilet 2000 smashed the treehouse in Captain Underpants and the Tyrannical Retaliation of the Turbo Toilet 2000. It is included in a special edition of Captain Underpants and the Revolting Revenge of the Radioactive Robo-Boxers.

Plot
Dog Man is the greatest cop in the world, but he keeps getting on Chief's bad side, with Dog Man often chewing on Chief's shoes and drooling on his paperwork. Chief tells him he's a awesome cop but a bad dog. Dog Man promises to be good, but bad days are on the way. The next day, Dog Man is taking Petey to jail. On the way, Petey finds a ball and Dog Man cannot resist it. Petey throws it, leading to Chief firing Dog Man.

That night, Dog Man digs under his house and uses his money to buy mysterious things. The next day, Petey bulids a robot suit to attack the city. The police are scared, so Chief has to stop Petey himself, but he gets kidnapped. Dog Man (as The Bark Knight) then drives in the Dogmoblie to save Chief. Petey traps The Bark Knight in a web, but he escapes. Petey then prepares to throw Chief off a cliff, leading to a literal cliffhanger.

Trivia

 * This comic marks the debut of Dog Man's Bark Knight alter ego.