Having been turned inside out by the escaped Lycos Bill in the aftermath of the Halley's Comet Gang, Nevada pleads with Red to find a way to turn him back. As Nevada has less than a day to live, Croach joins Red on her quest to help track down Bill and retake the gun. The Preacher and stays with a gun trained on Professor Genius to ensure that the science alien does everything he can to keep Nevada alive.
Red and Croach ride in an imposed silence until the tracker finds himself plagued with feelings of alarm and fear, and he begins to realize that he is changing despite his better judgement. Over the course of the day, Croach recognizes these feelings as positivity at the prospect of two of the best humans of his acquaintance copulating, but The Red Plains Rider insists repeatedly that she and Nevada would only see each other socially.
Back at the Mission, the Professor rummages for a device that may or may not help to slow the effects of Inversification. The machine does not initially appear to work but rather causes consternation for Nevada while Professor Genius does his best to calm the marshal.
Lycos Bill goes on a wild Inversification spree, targeting wildlife and ultimately the Caves of Zyzyx, releasing the giant spiders within. As the spiders emerge, Red and Croach arrive with an offer to give Bill a head start. Laughing at their offer, Bill fires The Inversifier at the spiders before one of the creatures snatches it and makes off into the cave. Croach darts in after the gun and throws it to Red, but both he and the Preacher are carried off into the depths of the caves by the giant spiders. The Preacher is overcome, but Croach is left alive to be hatchling food. At the Martian's urging and against her will, Red carries the gun back to Nevada.
The Preacher and Professor Genius get into a theological discussion at the ruins, and despite the desire to write a paper on the existence of God, the science alien finds no data to support his paper. As the machine helping Nevada to stay alive fails, Red arrives and cures him with the Inversifier. Instead of returning immediately to save Croach, Nevada instead badgers Red for a kiss. Disappointed in her choice of mate, Red returns to the Caves of Zyzyx to save Croach.
Lycos Bill is seven feet tall according to Sparks Nevada. This tells us that robots are not necessarily built in precise likeness to humans.
- Sparks Nevada - Marc Evan Jackson
- Croach the Tracker - Mark Gagliardi
- The Preacher - John DiMaggio
- The Red Plains Rider - Busy Phillips
- Professor Genius - Danny Pudi