1990 Original Video film.

The cockroaches of Saito's apartment live in peace with their human host, who gives them lots of space to breed and plenty of leftovers to munch on. In the midst of these high living times, Naomi and Ichiro plan to get married and start a family. But when a hard-bitten stranger roach named Hans appears with news of war with the humans across the lawn, it foretells disruption-not only of Naomi and Ichiro's relationship, but of the hive's entire way of life.

Ultraman Zearth hails from The Land of Pikari in Nebula Z95. He has a big red face and dislikes dirt, and will go to great lengths to wash it off his hands. His goal is to clean the polluted Earth. He transforms with an electric toothbrush, which is consistent with his hygiene fixation. He's not quite adept at being a superhero, but at least he tries his best.