Earth is invaded by the criminal organization known as Makuu, led by Don Horror, who had first destroyed a space colony near Earth. Don Horror wants to dominate the whole universe, and the Earth represents an obstacle that he has to overcome by turning it into a domain for all evil. In response to Makuu's attack, Space Sheriff Gavan of the Galaxy Federal Police is deployed to Earth to defend his mother's home world.

Kenji Ohbaas Retsu Ichijôji / Space Sheriff Gavan
Wakiko Kanoas Mimi
Kyoko Nashiroas Marin
Sonny Chibaas Space Sheriff Voicer
Tamie Kubotaas Tamiko Ichijouji
Masayuki Suzukias Kojiro Oyama
Toshiaki Nishizawaas Commander Qom
Miyuki Nagatoas Horror Girl
Kotoe Taichias Horror Girl (voice)
Issei Masamuneas Narrator
Shozo Uehara
Tomomi Tsutsui
Yoshiaki Kobayashi