The following is an answer and/or comment by inhahe aka ColorStorm (inhahe.com - myriachromat.wordpress.com).
No plan, and I doubt aliens would attack. If they're advanced enough to make it across interstellar space, they're probably advanced enough to not to live in such a primitive mindset as to want to hurt and destroy other civilizations, or to be caught in patterns of rampant consumerism and unchecked procreation like we are to need to steal resources from other planets. I think our common fear of aliens attacking is mostly the result of projection from our own mindset and the fact that we tend to attack each other.