Captain Clayton is a seasoned military officer. He previously commanded test flights for advanced aircraft, including the experimental G-Reaction-powered fighter piloted by James during a critical incident on January 1, 1995. During that flight, James reported encountering unidentified flying objects before vanishing with the aircraft.

This event profoundly impacted Clayton, fueling persistent but initially unsuccessful efforts to convince governmental authorities of an imminent extraterrestrial threat. He spent years advocating for preparedness despite official skepticism. His warnings proved justified when alien forces, known as Baguans, initiated their invasion.

Clayton collaborates closely with scientists like Dr. Brest to develop defensive technologies, contributing to the creation of the Sky Knight fighter plane designed to combat the Baguans. He evolves into a mentor figure for young protagonists Billy Kimura and Penny Carter, recognizing and valuing their exceptional observational skills and intellect. He guides their involvement in the conflict.

The unexpected return of James, who survived his disappearance altered by alien experimentation, forces Clayton into significant emotional development. Their reunion strengthens their bond, transforming their relationship into one of mutual respect and near-equality. Clayton and James fight alongside each other as crucial defenders of Earth.

During the final battle against the alien invaders, Clayton sacrifices himself deliberately to ensure the protagonists have sufficient time to execute their plan to defeat the Baguans, directly enabling Earth's victory. He embodies the role of a steadfast and experienced leader, bridging the gap between adult authority figures and younger heroes while maintaining unwavering dedication to planetary defense.