Las Naciones Unidas reúnen la última arma para derrotar a Godzilla, mientras que los científicos descubren un huevo de pteranodon fresco en una remota isla japonesa.

Animales gigantes mutantes y pterosaurios prehistóricos emergen de una mina japonesa, aterrorizando a toda la población.

US dubbed and edited version of the Japanese film Rodan. A mining engineer investigates the death of his fellow co-workers and discovers prehistoric dragonfly nymphs emerging from the mines. As he heads deeper into the mines, he makes a more horrifying discovery in the form a prehistoric flying creature.