A Terrible-Monster sent by Namahage, the legendary phantom. It emits a flash beam that blinds those who see it, as well as a paralyzing ray. Additionally, it can generate blizzards from its mouth and both arms to attack.

It first appears in human size, emerging from a snowman that Namahage sent to the orphanage Shunpuen. It blinds the orphanage teacher with its flash beam and then vanishes. Later, it reappears in its giant form in the B District of Tokyo, causing destruction throughout the area.

Ultraman Ace then appears to confront it. Despite Ace's attempts to subdue it with his Shooting Beam and Metalium Beam, Snowgiran withstands the attacks and temporarily defeats Ace with its flash beam and blizzards. It even blinds nearby civilians and launches an assault on Shunpuen. However, the tide turns when Ultraman Ace is revived by Father of Ultra, who appears dressed as Santa Claus.