Pinkie Pie tells the Cutie Mark Crusaders a story. It is about an Espurr who nearly destroys Equestria. But Espurrs don't exist, right?

Right?
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Twilight Sparkle will learn a very valuable lesson today. Everything comes with a price. And if that price is staring at the world's most adorable creature while letting it destroy everything she loves, then so be it.
But Spike isn't about to let that happen. Even if everypony else seems too incompetent to try and stop this creature of master destruction and ultimate cuteness, then he will try.

The image came from Google images and I cut a little out in paint.