Gamera 2: Attack of Legion (1996)
Gamera 2: Attack of Legion is a 1996 Kaiju film directed by Shusuke Kaneko. It is a sequel to Gamera: Guardian of the Universe and the tenth Gamera film in the series. The film introduces the Legion, a race of insectoid extraterrestrials that invade the Earth, prompting Gamera to come to the planet's defense.
More at Wikipedia.