Some time after Godzilla's battle with Hedorah, a new threat emerges. Gigan, a cyborg dinosaur from the outer space, confronts Godzilla while trying to invade the Earth.

A short sequel to Godzilla Appears at Godzilla Fest, released on G-Fest 2021 and dedicated to the 50th anniversary of original Godzilla vs. Hedorah (1971).