Suspected of secretly dealing with Krulos, Questar shocks his people by refusing to submit to Trial by the Path. He enters voluntary exile until he can clear his name and leaves Gunner, Mind-Zei, and Icon in command. But without a single leader to guide them, the Dino-Riders are helpless in the face of Krulos's most severe assault to date. The Rulons' victory looks assured once the Brontosaurus is brain boxed, yet the few Dino-Riders who manage to escape renew their hope of survival thanks to an unexpected source of help.