An immortal monster that has the ability to regenerate even if cut into many pieces. Raiveking attacks enemies with flames from its mouth. Raiveking is always laughing and can eat almost anything.

Raiveking hid in the ground on the riverbank of the Tama River. Ultraman Taro was fighting against the Great Liquid Monster Cosmoliquid. As Cosmoliquid changed into liquid form, Raiveking stuck out its nose and consumed the monster whole, also inhaling Kotaro Higashi. ZAT pierced Raiveking with a high-pressure pipe and extracted Cosmo Liquid. Then they doused Raiveking in pepper which made it sneeze which sent Kotaro flying out of his nose.

After ZAT battled the monster, Kotaro transformed into Ultraman Taro and fought Raiveking and Cosmo Liquid in a three-way fight. Raiveking broke Taro’s arm, but Taro froze the monster with his Ultra Freezer and then blew Raiveking to pieces with his Strium Beam.

After Raiveking regenerated, it hid underground again. ZAT lured it out into the open, where Taro and Mother of Ultra carried it to space and killed the monster with an explosion.