A mad cultist decides that the best time to fulfil a forgotten prophecy and open a portal to the interdimensional void is now. As he himself is unable to do so, he requires the aid of somepony more magical. And he knows just the pony for the job..
A bioform originating from the planet known as Earth. Incapable of self-levitation. Batteries not included. Self-declared mortal enemy of logical inconsistency.