While gathering starburst flowers for the Fairy Moon ball, an accident breaks Isabel's trust in River, allowing a mysterious stranger to step in.

On a Sapphire camping trip, a constellation that only appears every five years sends a special surprise down to Earth. But something troubles Wildstar...

Using a sleepover at the stables as their cover, the Sapphires sneak out in search of the crown stars. But they're not the only ones looking.

A legendary unicorn rider visits campus, stirring tensions between Sophia and Valentina. Layla gets jealous when Glacier reunites with an old friend.

Ms. Wildwood tasks the Sapphires with keeping wild unicorns safe from a volcano, which Sophia uses as an opportunity to search for another crown star.

Sophia races to Starglow Lake to battle the Star Snatcher for the last crown star. Back at the dorms, Rory tries out for a secret society of pranksters.

For their final test, the students must infiltrate ogre-guarded ruins and rescue a hostage before the last bell rings... or risk immediate expulsion.

Working together unlocks a new bond for the Sapphire riders — and with it, new abilities. Then, Valentina comes clean to Sophia about the crown stars.

Sophia's good intentions lead to catastrophic events. Now the fate of Unicorn Island depends on the Sapphires — and the one test they dare not fail.