Venomous Skumm introduces his new formula, rat rot, into the local water system. It transforms anyone who comes into contact with it into mutant rats. Skumm's goal is to turn the earth into a planet-wide vermon carrier. His plot can only be countered by the Planeteers and Captain Planet, but not before some of them accidentally get a dose as well.
Elenco: Frank Welker , Joey Dedio , LeVar Burton , Whoopi Goldberg , Janice Kawaye , Kath Soucie , Scott Menville , Buster Jones , Clyde Kusatsu , David Warner , Dean Stockwell , Edgar Gilbert , George Hearn , James Coburn , Jim Cummings , Lewis Arquette , Margot Kidder , Martin Sheen , Tim Curry , Whoopi Goldberg .