A strange meteor lands in Japan and unleashes hundreds of insect-like "Legion" creatures bent on colonizing the Earth. When the military fails to control the situation, Gamera shows up to deal with the ever-evolving space adversary. However the battle may result in Gamera losing his bond with both Asagi and humanity.

Toshiyuki Nagashimaas Colonel Yusuke Watarase
Miki Mizunoas Midori Honami
Tamotsu Ishibashias First Lieutenant Hanatani
Mitsuru Fukikoshias Obitsu
Ayako Fujitanias Asagi Kusanagi
Yukijiro Hotaruas Tsutomu Osako
Zen Kajiharaas Mano
Tomorowo Taguchias Ishida