Gamera vs. Barugon

Gamera escapes from his rocket enclosure and makes his way back to Earth as a giant opal from New Guinea is brought back to Japan. The opal is discovered to have been an egg that births a new monster called Barugon. The creature attacks the city of Osaka by emitting a destructive rainbow ray from his back, along with a freezing spray capable of incapacitating Gamera.

The Invisible Man vs. The Human Fly

A series of ghastly murders are being committed. The one similarity in each of the murders is that a weird buzzing sound is always heard right before the murder occurs. Is the killer invisible or possibly some other incredible creature?