It's up to Gamera to save the world from a colony of beetle-like creatures that fell to Earth from outer space. It is the 10th entry in the Gamera film series, as well as the second film in the franchise's Heisei period, serving as a direct sequel to the 1995 film Gamera: Guardian of the Universe.

References:
https://en.wikipedia.org/wiki/Gamera_2:_Attack_of_Legion