The PowerPuff Girls discover their Christmas stockings are full of coal! There must be some horrible mistake! There is. And her name is Princess! Her fiendishly foul plot: to trick Santa into turning her into the fourth Powerpuff Girl! (And in the process, make him believe the Powerpuffs have been very, very naughty!) Now, Bubbles, Blossom and Buttercup must explode into a Yuletide tornado of bad-girl-thwarting action to put Princess in her place -and keep Christmas from disappering forever!