Spud gets angry when he sees Dumper Stubbs, a creepy delivery man, dumping oil into a storm drain and causing terrible pollution in the river. When Spud blows the whistle, he loses his job. Enlisting the help of his buddy, Dink the Thinker, and Connie Pan, Spud thinks he has a chance of regaining his job ... and stopping the Dumper's harmful activities.