Come on we got sewers to suck

Frank Drebin is persuaded out of retirement to go undercover in a state prison. There he has to find out what top terrorist, Rocco, has planned for when he escapes. Adding to his problems, Frank's wife, Jane, is desperate for a baby.

Once America's Jewel, Sewer City sits on the edge of her toilet seat, as all citizens tremble in fear of the Sewer City Killer. This foul, possibly eternal serial killer, has taken a liking to coming up through the sewer pipes, and murdering people as the sit on the toilet. The Citizens are fed up, and Mayor Fred Tickle-burger is feeling the backlash. He hires a homeless plumber, who goes only by the name, Bum Plum, to hunt the serial killer, and destroy him. To make sure the bum doesn't lose his nerve, he holds his hooker wife, hostage. Who will win in the epic battle between circle saw, and plunger?