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During World War II, Frankenstein's heart is secured by the Nazi forces, despite protest from doctor Liesendorf who was studying it. Using a submarine, the heart is transported from Germany and handed over to Japan. The Japanese forces then take the living organ to a laboratory in Hiroshima. The hope is that the scientists there can unlock the secrets of the near immortal heart. Unfortunately, while the heart is under examination, Hiroshima is struck by an atomic bomb on August 6, 1945. The resulting conflagration burns the laboratory to the ground in seconds.
15 years later, in 1960, a boy is found roaming the streets, eating dogs, rabbits, and anything else the vagrant child can get its hands on. With word of the child spreading, it's not long before doctors Sueko Togami and James Bowen discover the boy for themselves, before the child quickly runs off. Next, reports come in of the vagrant child being cornered in a cave. The two doctors immediately enter the cave to try and locate the small boy they had seen the night before. The small child is found cowering in a corner, trying to scare away the onlookers. Sueko slowly approaches him and begins to befriend the child. Gaining his trust, the boy is taken back with the two doctors to their clinic for further study.
Once at the clinic, the vagrant child begins to grow at an alarming rate, as news of this miraculous discovery continues to spread. Kawai, a man aboard the sub that ferried Frankenstein's heart to Hiroshima in 1945, visits the clinic to see the doctors upon hearing of the remarkable child. Kawai tells the doctors of the incident, and how the heart was transported nearby before the atom bomb hit, leaving room for speculation that perhaps there is a connection.
 To follow up on Kawai's theory, doctors Yuzo Kawaji and Bowen both disembark for Germany. They seek out doctor Liesendorf, the man who had Frankenstein's heart before it was taken to Japan. Liesendorf explains that if the doctors want to find out if the child is a descendant of the Frankenstein's monster, then all they have to do is severe one of the child's limbs. If the boy is in fact related to Frankenstein's monster, Liesendorf assures them that it will regenerate its missing limb.
The two doctors return to Japan with the information. Doctor Sueko is mortified by the revelation and entirely opposed to harming the child. Kawaji, however, intends to find the answer by himself. He secretly goes to visit the child at night with the plan of removing one of the boy's limbs. The vagrant could hardly be called a boy anymore, though, as it was now much larger than a normal human being. The doctor is interrupted, though, when a group representing TTV barges down to where the child is being confined. The camera crew shines light at the overly large child as they prepare to film the creature. The vagrant goes berserk in response. It smashes out of his confinements and escapes from the clinic. The creature stops off at Sueko's house, to visit the young doctor one last time before it flees from Hiroshima. Shortly after the break out, a severed hand is found moving around the clinic, proving that in fact the monster is Frankenstein.
Following his departure from Hiroshima, Frankenstein ventures to Okayama, where it's discovered that the creature has grown to a height of four people. The monster continues its trek, next visiting Himeji, where the creature devours some of the local live stock before moving on. The monster is next sighted in Byoko, where it openly attacks a pleasure cruise ship. After pushing the craft, the monster sinks back into the water.
Back at the clinic, it's discovered that Frankenstein's hand has escaped. A short search is conducted, until the shriveled hand is found under a grid, dead from a lack of nutrients.
With word of the pleasure cruise incident spreading, combined with the local disasters caused by the monster Baragon who continues to leave no survivors to report his attacks, the Japanese Self Defense Force begins to mobilize to confront Frankenstein. It doesn't take long before the military is alerted to his position. Appearing in the mountains, Frankenstein inadvertently destroys a cabin while trying to throw a tree at a bird. In response, the defense force mobilizes troops and tanks to the area. Frankenstein hears the tanks, interrupting an attempt to capture a large boar. Avoiding their direct line of sight, the monster quickly flees before the tanks even have a chance to take aim. Unfortunately for the defense forces, a tank falls prey to the trap Frankenstein set for the boar. Driving over a collection of foliage, the vehicle falls into the hole Frankenstein dug. The complication gives Frankenstein ample time to escape to a safe distance.
Meanwhile, Baragon is attacking a nearby village. The subterranean monster devours the small population and flattens the structures. The military arrives too late, and blame Baragon's attack on Frankenstein. Word then spreads that Frankenstein has trapped itself in an abandoned ammunition cave. The SDF quickly disembarks and confronts the trapped creature. The soldiers in charge quickly open fire on the beast, but their attacks appear to have no effect and Frankenstein quickly flees from the cave.
Doctor Kawaji, still insistent on furthering his study, goes after Frankenstein. He hopes to preserve just a part of his body that can be taken back to the clinic. Bringing with him explosives, the doctor planned to confront the monster head-on. His plan backfires, however, as the monster Baragon is awakened by a test explosion. Ready to descend on the defenseless physicians, Baragon is instead attacked as Frankenstein rushes to their aid.
The two titans clash in an epic battle, as Frankenstein uses a combination of agility and intelligence to outmaneuver Baragon. The giant humanoid eventually wins, as he chokes Baragon to death. The monster is victorious, but has no time to celebrate over the fallen Baragon as a fissure opens. The seismic event casts both of the monsters down into the depths of the Earth. |
