The group follows the Rainbow Road into a deep, dark hole, where a Moletaur locks them in jail and informs them that they'll face the judge.

Zulius brings the herd to Cataur Valley, where the shaman is fuzzy but fierce. To earn a piece of the key, Horse goes glam for a silly competition.

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

On a trip to the Underground Kingdom, Horse learns that Rider has a magnificent new horse named Becky Apples. Would Rider really replace her?