Alien Hipporito are a race of aliens originating from a hell-like world. They make their first appearance in the Ultraman franchise as antagonists in Ultraman Ace.
While Yapool was recovering from his defeat by Ultraman Ace, Alien Hipporito traveled to Earth to attack the Ultra. Hipporito trapped Ace in a glass chamber, but not before he could signal to the other Ultra Brothers. Ultraman, Zoffy, Ultraseven and Ultraman Jack arrived, but they soon fell victim to the same fate.
However, the Father of Ultra appeared and freed Ace before engaging Hipporito in battle. The Father of Ultra looked to have the advantage until Hipporito blinded him with a laser attack. However, the Ultra Father gave his color timer to Ace just before dying, With the Father of Ultra's energy, Ace was able to easily overpower Hipporito, destroying the alien with a Metallium Beam. With Hipporito dead, Ace moved on to reviving the Ultra Brothers and Father of Ultra.