Searching for the next piece of the key, Horse leads the herd into a mysterious forest to see the tree shamans. They grant wishes — but there's a catch.

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.

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.