A Boy's Best Friend's Enemy

Gus chases a cat to Under and she takes Bob hostage, using him to fly her away from Gus to Near Under, the dog and the Frags (who don't understand the dog-cat feud anyway, believing peace was better) in hot pursuit. However, Auntie First is waging a war with her Cousin Tess, the leader of Under Sea because they once wore the same dress to their school prom. Russel tries to stop the war since all the sea creatures are being forced to flee to Under due to it. However, once Russel saw that the dresses weren't actually the same, the evidence was destroyed.

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S01E20 - Auntie Gravity