After destroying SpaceGodzilla, Godzilla retreats to a secluded sanctuary known as Monster Island, a haven for titans where Godzilla lives in peace keeping the balance of nature intact. Here he finds a mysterious lonesome egg which hatches into a Baby Godzilla. Godzilla adopts this small hatchling and mentors him to become strong like the King of Monsters that he is. Elsewhere, an oil rig explodes causing massive pollution near wildlife, this was caused by an alien smog monster called Hedorah, who feeds off the pollution of Earth and attacks Monster Island. Both Godzilla and his son along with few new friends try teamwork and strategy to destroy the Smog Monster and save their home.
