Frank tends the garbage heap in the monster realm, just on the other
side of the human world. In his spare time, he builds inventions out of
garbage scraps. One of his inventions is of a human-inspired robot, with
a stained t-shirt as the body. But Frank can't seem to get the robot to
work. One strange night, a bolt of lightning transforms the invention
into a real human child! Frank names him "Stain." Curious and energetic,
Stain wreaks havoc on the monster realm, angering the monster
population. Can Frank save Stain from destruction by convincing the rest
of the monsters that Stain is not a threat?