Horse meets Waterbaby — one of Centaurworld's shamans — and learns about the key: a mysterious object that could reunite her with Rider.

The herd makes it to the Rift and reminisces about their time together while waiting for Waterbaby to arrive with the final piece of the key.

Horse and Rider face a frightening enemy. Back in Centaurworld, the herd summons up the courage to enter the void and fight for their friend.

Horse tries to enlist the fierce Coldtaurs in her battle — but they capture Glendale! Back in the human world, Waterbaby sends a message to Rider.

All of Centaurworld's residents gather for the hootenanny. But can Horse turn this colorful collection of creatures into a fearless army?

Horse leaps into the Nowhere King's mind and learns his haunting backstory. Meanwhile, Rider and the herd come up with a plan.