After a war between Equestria and Earth, the former had lost, 'thanks' to the betrayal of certain ponies who discarded their goodness in order to help humans.

But a certain pony from another dimension didn't want to see any version of Equestria to be at humans' mercy, justly thinking that it won't do ponies any good. So she decides to interrupt the negotiations and set right what was wrong.

A proper answer to this moronic and overall horrible fic. (Note: I'm attacking the fic, not the author.)