Set between the events of Gamera 2: Attack of Legion and Gamera 3: Revenge of Iris, A massive skeleton with a giant jewel is discovered during an expedition. It turns out that this jewel is the egg of Barugon, which hatches. The hatchling grows gigantic at a remarkable rate, and then attacks Japan with his icy breath and rainbow ray. Asagi contacts Gamera to fight Barugon, who has now engulfed Tokyo in an ice storm. Barugon's speed was increased in the storm.
