A team of ponies from Earth comes to Equestria in search for something. Twilight is delighted by the idea of traveling to other planets, but also learns that many of those planets are enslaved by immortal rulers who are worshiped as gods. The Mane 6 join the ponies from Earth to put an end to this tyranny and war.


I would want to put the dark-tag away, but war happens and ponies die. So: rated teen

canon usage:
MLP: everything until halfway through Season 3's finale. Twilight is no princess nor has wings nor was transported away after finishing the spell.
Stargate: none. No humans and no ponyfied characters, but a completely ponyfied planet Earth