While on a school camping trip, Rex tells the scary story of the "Thinder Man," a mysterious creature that lives in the woods. Rebecca is determined to see if the story is true and tries to summon the Thinder Man. Instead, Bat Pat and the kids discover a featureless darkness creature that creates a small aura of permanent darkness around herself. The problem is, living in permanent darkness makes it difficult to see, so she always bumps into things.