Dinky Doo, Snails, Twist, and Pipsqueak are out getting candy on Nightmare Night when they realize that there's too many of them. Some thing is among them, disguising itself as one of them...but for what purpose...?

This is a Lunaverse story, but no real knowledge of the Lunaverse is needed for it other than the fact that nopony's met changelings yet. New readers welcome!