I think that either there is some kind of enemy that is kind of like Galactus. Or Someone on your homeworld sold out the planet to a Galactus type or super humanoid alien race. Or maybe..... you build up to fight this enemy... you finally go through a black hole that takes you back in time and you save your homeworld and you realize you created an AI life form that goes back in time itself.... like the terminator and blows your planet up. You then have to build up and go into the past before it gets there and beat yourself so your creation does not destroy your own homeworld! Lol maybe thats a little too deep! What Do you guys think??