A UFO is sighted over present day Tokyo; in reality, it is a time travel device carrying representatives from the 23rd century with an urgent message about the future of Japan: there is no future. Godzilla is about to destroy the whole nation. To stop the birth of Godzilla, the travellers return to the past, where they are confronted by an even greater threat, King Ghidra, a horrific three-headed reptile with breath of fire.