Dino-Riders (1988)

Rasp's work on a new pulse cannon at the Rulons' weapons refinery causes some chemical waste to be disposed into the river. Many dinosaurs fall ill because of this pollution; Yungstar becomes so infuriated that he doubles his resolve to end the Rulon threat once and for all. His hatred grows so intense that he loses his ability to communicate telepathically. Somehow, Yungstar must reclaim the Path before he is hunted down by Krok and Lokus.