A typhoon washes ashore a giant egg. Before it can be studied, the local villagers claim the egg and sell it to greedy entrepreneurs. The Shobijin soon arrive to plead for the return of egg as it belongs to Mothra. At the same time Godzilla arises near Nagoya, washed ashore by the same typhoon. It is now up to Mothra defend its egg and Japan from Godzilla.