During Nightmare Moon's escape from her lunar prison, by complete chance she accidentally free's another, alien, prisoner from his death sentence. However, when he crash lands just outside Ponyville, he sets forth on his prime directive:
The REGIS MK V will destroy all, none can possibly stand in his path.

While a diminutive threat at first, there is a reason why this nightmarish mechanization was about to be thrown into a black hole... and this world is about to learn exactly why.
~~~(Disclaimer)~~~
I did not create, nor do I own any of the characters in story.
Instead, Megas XLR (Produced by Cartoon Network Studios) and all characters referenced to, mentioned, or that may have appeared in this fanfic from said show were created and are owned by Jody Schaeffer and George Krstic