An Equestria Girls Crossover. That means: If you don't like Equestria Girls, then this isn't for you.
Kingsly and Trippy thought they were done, done with the military, and ever working for the government. But one last mission awaits them, one that could bring Equestria to an end, if they fail. They must find Princess Twilight Sparkle, who ventured to an alternate dimension on a mission, but never came back. They must travel to this new place, and find her, no matter the cost.