Orko is a fictional character from the He-Man and The Masters of the Universe cartoon. His story is told in the episode intitled "Creatures from the Tar Swamp" (1983). Apparently, when Prince Adam and Grenger were young, they were playing around in the swamps of Eternia, their home planet. Suddently, a fierce storm broke lose, and a temporary portal was opened between Eternia and Trolla, Orko's home planet. Orko was drawn through the portal, and it closed behind him.

The storm also caught Prince Adam and Grenger by surprise. They fell into some quick-sand, and were near certain death. Orko, drawing his magic medallion from the O on his shirt, conjured up a tree branch and saved young Prince Adam and baby Grenger. Unfortunately Orko was careless (a skill he soon mastered) and lost his medallion in the swamp.

Ironically, if it was not for Orko's magic, Prince Adam would have never meet the Sorrceress, so He-Man and Battle-Cat would have never been created.