A deranged alchemist named Cortez discovers a potion that restores youth, but it requires the tail spikes from stegosauruses, which he is systematically hunting and killing. While investigating the dinosauricides, Karl and Marion have a run-in with the Outsiders.

Crop-harvesting dinosaurs are infected by a virus, and Le Sage has stolen the only medicinal plant that can help.

Frank arranges a boxing match between David and Alano, one of LeSage's Outsider crew. Meanwhile, Frank and LeSage become friends, and the senate tries to find a way to ban the fight.

Karl must learn some lessons in love, when a toad, the Wartosa Vulgaris, sends him into a time loop. Stuck in time, he has to keep reliving the same passionate moment with Marion until he gets it right.