This also serves as the final story arc of the series altogether.
The saga started in "The Greater Hater," with Lord Hater falling low on the level of cosmic threat, which is when Lord Dominator, supposedly a far better hater than Hater himself, makes his appearance.
The second episode in the saga, "The Battle Royale", reveals Dominator's true gender, a female, having been found out by Wander, then tries to pair her up with Hater. However, not only does the matchmaking cause a huge battle between a lot of villains and Dominator, but it only works for Hater, who falls in love with the humanoid.
The penultimate episode, "My Fair Hatey", had Dominator's true plan be revealed as the absolute destruction of the current galaxy. Also, Hater and Wander finally get the hint she's nothing like what they expected, and in a failed attempt to get rid of her for good, she obtains ice powers alongside her lava powers. Seeing their mistake, Wander, Hater, Sylvia, and Peepers decide to save the galaxy.
The final episode of the Lord Dominator Saga and the whole Wander Over Yonder series altogether, "The End of the Galaxy", has Wander, Sylvia, Hater, and Peepers save the last surviving planet from being destroyed by Lord Dominator. After a failed attempt to destroy the planet, Dominator gets defeated.