Sonny Lynx is a psionic warrior recruited to defend Earth against the cosmic entity Genma. Hailing from New York City, he previously led a teenage gang before his recruitment. His primary psychic abilities include teleportation and phasing through solid objects.

Identified as one of Earth's scattered psychics by Princess Luna and the cyborg Vega, he joins their assembled team. During the conflict, Genma's minion Zamedi captures and imprisons him within a crystalline structure. This confinement forcibly drains his psychic energy to empower a colossal magma creature serving Genma's forces.

He remains trapped until fellow psychic Jō Azuma frees him during a Tokyo battle. Following his rescue, he participates in the final confrontation against Genma alongside the international psychic collective. His specific actions during this climactic battle are not detailed.

His involvement is documented solely within the narrative of the 1983 anime film *Harmagedon*.