Equestria. Yep. And its fun at first, because there are lots of new thingies to kill, and new shiny stuff to steal. But then, as Grimskull and his ladz venture out of the Everfree Forest, and deeper into Equestria, they must deal with new... squig-fings who talk, and don't even know his species, let alone name. The boyz must keep firm. This "Frendship" that the squig-fings talk about is a load of rubbish. All Grimskull wants is to kill stuff and steal its shiny things. And they all need to make it off this planet sane (by Ork standards, anyway).
That would require some good pilots and mechanics.
Unfortunately, the only things around that can offer these are the very squig-things he hates...