Our hapless heroes now have to sneak into the factory and discover what's going on there but, while trying to escape, the one guy who was looking for his brother gets caught on a weather balloon and floats away. He ends up on the nearby Infant Island, where the Mothra cult is busy singing and dancing for the giant Moth, and there he finds his lost brother, alive and well.
He and his brother take a canoe back to the Nuclear Island, while the others discover Godzilla sound asleep inside a mountain on the island and they decide to wake him up (Bad idea I would say, but these people don't seem to be very smart...). So Godzilla is awake just in time to prevent the Crab Monster from killing the two brothers in the canoe. The two monsters fight for a while but the confrontation ends in a draw as Godzilla has to go take a dump. While he's sitting there answering the call of nature, a giant bird (Rodan? naaa...) comes out of nowhere to attack him. Godzilla roasts the giant bird with a couple of shots of his breath and returns to finish business when some jet fighters attack. Once again, he is interrupted and has to take out all of the fighters. He then goes on a rampage (because I guess he's now constipated) and starts to destroy the nuclear station, so the bad guys set the place to go thermonuclear.
The bad guys try to escape in their whooping boat, but the native slave laborers mixed up the formula for the monster repellent, and so the Crab Monster destroys the bad guys' boat. Godzilla and the Crab Monster have a rematch and Godzilla wins decisively (and gets to have delicious crab claws for dinner!). The natives and the guys are next busy building a net so Mothra can save them. And, right on time, Mothra arrives, knocks Godzilla on his ass, and picks up the net of people, taking them away to safety. Godzilla is alone on the island and somehow figures out what is going on, so he jumps off just before the nuclear station blows up.
Experiment #213 (2/2/91)