Frank Mullen

One day, a shrimp fisherman catches a large tadpole. Dr. Yano discovers that the captured animal is not a tadpole, but a life form that originated in some chemical way in the polluted water of the bay. During experiments, the tadpole grows very rapidly and escapes, returning to the polluted water of the bay and growing into a monster. There happens to be another monster in the bay: Godzilla, in which the tadpole Hedra engages in a fight with.

Through an experiment by Dr. Stewart with animal cells, a monster is created that is given the name Frankenstein. He is a gentle giant, but he escapes his guards and was supposedly killed on a mountain. After several years, a ship off the coast is attacked by a green monster, where the people think of Frankenstein. The green monster attacks the fortified country, in which the army is then called in for help. When a brown monster suddenly appears, Dr. Stewart understands that his Frankenstein was not killed, but has reproduced.