"Who says princesses don't wear black? When trouble raises its blue monster head, Princess Magnolia ditches her flouncy dresses and becomes the Princess in Black!" --

The Princess in Black and her faithful pony Blacky are called upon to rescue Duff and his goats from an invasion of cute, seemingly harmless bunnies from Monster Land.

A sleepy Princess in Black takes a much-needed vacation and rides her bicycle to the seaside, where she plans to nap in a hammock, but her peace is disrupted by a roaring sea monster.

When a goo monster crashes the science fair, the Princess in Black is on the job, and with the help of the Princess in Blankets, sets out to save the science fair.

"The Princess in Black is ready for her snowy playdate with the Goat Avenger and the Princess in Blankets. It's a perfect day to build snow monsters and battle them for practice. But just when they're about to wage battle, a huge foot smashes their snow monster. "SQUASHY!" It's a giant, and it's smashing everything in its path! The giant is too strong for the three friends, so the Princess in Blankets has an idea: it's time to light the Sparkle Signal...