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Thundarr, Ariel, and Ookla meet an old man who's attacked by ratlike creatures called Groundlings as he's attempting to deliver a rare Black Pearl to the village of Manhat (formerly Manhattan, New York). They help him and try to finish the delivery, learning its powerful secret in the process when they encounter the evil two-headed wizard Gemini, who wants the pearl for himself and is willing to destroy Manhat to get it from Thundarr.moreless
A spaceship lands on Earth where an alien predator captures people of a village and Ariel as a new source of food. Can Thundarr save them before the alien returns to its homeworld?