Horse tries to recruit an army to defend Centaurworld, but no one wants to join. The herd visits the Horsetaurs' castle to see if they'll help.

Up in their cloud condo complex, the Birdtaurs have been obsessively watching the herd: Horse and friends are their favorite reality stars!

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

Horse discovers a powerful ability: She can jump into backstories! And seeing the tough times her herd friends faced helps her feel less alone.

Rider defies the general's orders and goes to the Nowhere King's castle to get the artifact. But her new horse, Becky Apples, isn't exactly cooperative.

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.