When lightning strikes an overly jealous girl who wanted to be a weather personality, she becomes Weathervane, a being with the power to control weather, and bring forth chaos on Acmetropolis! It's up to the Loonatics to stop her before she destroys Acmetropolis with her "rain" of terror!

Mallory Mastermind, Sypher, Weathervane, and Massive have been unwillingly recruited by a mysterious alien being known as Optimatus.

Zadavia reveals the location of Optimatus' hideout and the rescue on Danger Duck. When Zadavia is captured, the Loonatics must rescue her, save Acmetropolis, and defeat Optimatus.