|Size||between 20 and 300 nanometers|
|Role||Use the cells of human body to reproduce.|
All viruses shown in the series have similar form. They resemble Nabot, the thin bully and one of the antagonists from Once Upon a Time... Space. They usually appear as segmented, yellow worms, often accompanied by green stripes or marks. The leader has a kite-shaped head with a long, red nose and three-directions red hair. Viruses do not always look as worms, as they can have different bodies as well.