Not much is known about the Ice Giant's appearance, except that it was about the same size as Gamera, and that it also would have been entirely composed of ice.
According to tokusatsu historians August Ragone and Jason Varney, the character would have been modeled after the Jotunn - fearsome Frost Giants from Norse mythology, in particular Ymir, who was said to be the biggest and most monstrous of all the Frost Giants.
Had these plans gone through, this would have made the Ice Giant the only humanoid-shaped opponent faced by Gamera, as his various film foes tended to be on the wildly non-human animal side of creature design.
After Gamera was freed from his rocket that was carrying him towards Mars, he flies home to defend the humans from the Icemen and their nefarious plans. However, the aliens deploy their trump card, being the Ice Giant. The two monsters battle, with Gamera ultimately being victorious.
- The Ice Giant's characteristics may have ultimately inspired two of Daiei's classic monsters.
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