Bubble Berry has done his best to model Pinkie Pie's world in every aspect, but when Discord manages to enter Bubble's domain, the clock is rewound, and Discord breaks the mane 6 colts apart before they even have a chance to meet. Bubble must bring his friends together again before Discord grows powerful enough to wreck their sister universe once more.
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What I mean by alternate universe is that all important characters (mane 6, the princesses, etc.) are genderbent, so this is MLP as colts.