Something has changed the clean creek water into slimey mud. It gets so bad, Peg Platypus can no longer swim and the rest of the gang can’t drink it. When Kevin Kangaroo and his friends go upstream to investigate, they find a family of pigs rolling around in the mud and polluting the water. While the gang try to find a way to convince the pigs to leave them alone, Wally Wombat finds a new friend that might be able to help.