Track of the Moon Beast

Paul transforms into the Moon Beast because a fragment of a lunar meteorite lodged in his brain during a meteor shower in Albuquerque. The meteorite fragment reacts to moonlight, triggering the transformation whenever the Moon appears. In his human form, Paul experiences dizziness and nausea, while in his transformed state he becomes a savage, lizard-like creature with no memory of his humanity.

The meteorite strike in the opening scene immediately sets the cause for all later transformations.

The meteorite fragment lodged in Paul's skull reacts to lunar cycles. When the Moon is visible, the fragment's properties interact with the moonlight, physically transforming Paul into the Moon Beast. This is confirmed through NASA analysis and X-rays that show the fragment in his brain.

Early scenes show Paul's symptoms worsen on nights with a visible Moon.

The meteorite fragment has disintegrated by the time doctors analyze Paul's condition. NASA brain surgeons realize the fragment has broken down and spread throughout his brain, making surgical removal impossible. This also reveals that Paul will eventually self-destruct as the fragment fully degrades.

The NASA analysis comes after another X-ray reveals the fragment's deteriorated state.

After learning that the meteorite fragment cannot be removed and that he will eventually self-destruct, Paul escapes into the desert on a stolen motorcycle. His goal is to end the danger himself by dying in the wilderness, preventing any more innocent victims from being killed during his uncontrollable transformations.

Paul's growing concern for Kathy's safety and the mounting death toll drive his desperate decision.

Johnny Longbow is a former anthropology professor with deep knowledge of Native American culture and legends. His background allows him to recognize that the Moon Beast phenomenon has occurred before, documented in ancient Native American paintings that describe the same curse from centuries ago. This knowledge becomes crucial in finding the solution.

Johnny's expertise is established early as he connects Paul's condition to historical records.

Johnny improvises a weapon using an arrow embedded with the original meteorite fragment. Since the meteorite fragment inside Paul is what enables the transformation, introducing the original fragment via the arrow triggers a catastrophic reaction. The collision of the two meteorite sources causes an explosion that destroys both Paul and the Moon Beast.

Johnny's recollection of Native American legends about similar phenomena guides him to this solution.

When Paul transforms into the Moon Beast, he loses all trace of his humanity and consciousness. The transformation is complete, he becomes a feral creature with no memory or awareness of his actions as the Moon Beast. This explains why Paul is confused about the killings and genuinely horrified when he learns the truth.

Paul's confusion about the violent incidents is evident from the beginning.

Sandia Crest is significant because it's a place Paul loved and frequently visited. Johnny remembers this and guides the pursuit there, knowing Paul would likely head to this meaningful location. The high ground and isolated setting provide the perfect stage for the final confrontation.

Johnny's intimate knowledge of Paul's favorite places guides the entire pursuit.

Paul must die because the disintegrated meteorite fragment cannot be removed and will eventually cause him to self-destruct. Additionally, his transformations continue inevitably with each Moon appearance, making him an ongoing threat to others. His suicide in the desert is the only way to prevent further innocent deaths.

The medical diagnosis makes clear that Paul's condition is terminal and irreversible.

After the Moon Beast is destroyed in the explosion at Sandia Crest, Kathy and Johnny reflect on the bizarre events in Albuquerque. The story closes with them dealing with the emotional aftermath of losing Paul, processing the strange fusion of science and myth they witnessed.

Kathy's devotion throughout the film makes her grief at the end inevitable.