Frankenstein vs. Godzilla

Frankenstein vs. Godzilla (フランケンシュタイン対ゴジラ Furankenshutain tai Gojira) is an unmade kaiju film.

that whould tern into Mothra vs. Godzilla (Godzilla vs. The Thing) and Frankenstein vs. Baragon (Frankenstein Conquers the World)

Plot
A scientist named Dr. James Bowen and his two colleagues, Dr. Sueko Togami and Dr. Kawachi, are studying the effects of radiation on survivors from the Hiroshima bombing. During his studies, Dr. Bowen stumbles across a small wild boy roaming the streets of Hiroshima.

Bowen begins to study the child and is amazed when he discovers that the boy is in fact the revived Frankenstein monster, regrown from a dissected heart that was then mutated by the atomic bomb's radiation. However, the small child quickly grows in size and cunning, as it begins to prey on the livestock and pets in the area as a means of food. Upon learning of the creature, and his rapid and growth, the J.S.D.F. becomes worried if the monster might turn on a more abundant source of food: human beings.

Meanwhile, Godzilla is discovered trapped in ice in the Bering Sea. The SDF decides to free the nuclear menace and lure the him to Japan, where he will hopefully fight and kill the Frankenstein monster. Taking action, the military breaks the icy prison from around the creature and lures Godzilla to the Japanese coast with ships. Once there, a series of towers with light beacons on the mainland lead the atomic dragon to the Mt. Fuji area.

At Fuji, the nuclear menace spots Dr. Sueko, but before any harm can come to her, Frankenstein rushes to the women's rescue and does battle with reptile. Frankenstein begins a hit and run type of battle with Godzilla, striking the dinosaur then retreating back into Fuji forest. The two titan's war is interrupted, though, by a series of volcanic fissures, as one swallows Frankenstein while another causes a great flood which knocks Godzilla backwards into a raging river and is washed away by the current, his final fate is unknown.

Next unmade film
Continuation: King Kong vs. Godzilla

Other titles
The Two conquerors of the World Frankenstein vs. Godzilla