The herd arrives at the rift and wonders where Waterbaby is. Once they enter the gate's building, the key pulls itself towards the rift and causes it to shoot a beam into the sky. The herd figures that this will probably get her attention.
Wammawink is hit by the realization that Horse is about to leave and she'll never see her again. She decides to spend the rest of the time they have left reminiscing, but the other herd members' ideas for doing this mostly fall flat and the Comfortable Doug arrives and monopolizes the spotlight by singing about himself alongside a number of returning characters. Wammawink is unwilling to let Horse go and tries to delay her departure by coming up with a neverending list of things they just have to do before she leaves, but Waterbaby eventually arrives and puts a stop to this, since Horse needs to go home.
Waterbaby activates the rift and sends Horse through. In the empty void between the two worlds, she encounters Rider coming from a matching rift, who has come through while pursuing a minotaur, and after some initial confusion the two tearfully reunite. As they prepare to leave, Horse remembers that she promised her friends that she would tell them that she made it through all right and turns back to do so, but the gates vanish and leave them trapped in the void.
In Centaurworld, the mysterious woman is revealed to have stolen the key and trapped the herd in order to close the rifts and keep something trapped in the void between the worlds; leaving Horse stranded is an acceptable price, in her opinion, since letting the entity escape would doom both worlds. In the void, a mass of black tar with a deer skull for a head materializes and faces down Horse and Rider — the Nowhere King has arrived.
This episode contains examples of:
- Bait-and-Switch Silhouette: In the void, Horse sees a familiar, young-lady-shaped shadow exiting a portal opposite of her. Eager to see her dear friend once more, Horse starts rushing towards it. But as she gets closer and closer to the silhouette of "Rider", the shadow reveals itself to be a silhouette of a minotaur. Thankfully, the real Rider is close by and slays the creature before it can hurt Horse.
- Big Damn Reunion: Even though Horse looks significantly different than when they last saw each other, once her friend recognizes her, Horse's reunion with Rider is every bit as heartfelt and emotionally fulfilling as she imagined it would be.
- Eldritch Abomination:
- Parodied in Wammawinks' farewell song, where one of the things she insists on doing before Horse leaves is making burnt offerings to Trebbor, a three-eyed Cthulhu expy that is just arbitrarily there for a few seconds.
- The Nowhere King plays this much straighter once he finally makes his first appearance, being a terrifying and enigmatic being with a deer skull for a head, multiple legs, and being made of Ominous Obsidian Ooze.
- "I Am" Song: Parodied when Comfortable Doug crashes the farewell party to sing about how he's Comfortable Doug and is, in fact, very comfortable.
- I Did What I Had to Do: Said verbatim by the mysterious woman — she knows she's likely leaving Horse trapped in the void with a monster, but she considers this necessary in order to prevent the Nowhere King from escaping into the world.
- Silent Credits: This episode's credits are mostly silent with ominous ambient sound referencing the Nowhere King slowly approaching the camera after making himself known in the void.
- Something Only They Would Say: Rider understandably doesn't recognize Horse at first, but when Horse sings the song Rider used to sing to her, Rider realizes that this talking cartoon animal can only be her Horse.
- Void Between the Worlds: The portals between Centaurworld and the Human World open into a white void, where the Nowhere King is imprisoned.
