Now that Disney owns 20th century Fox, they pretty much own the Alien franchise now. With that said, here is a scenario for you:
One day, the Xenomorphs invade Xandar and decide to make a new nest there. The Guardians of the Galaxy, noticing what is happening there, go to Xandar to stop the threat. Will they be able to stop them, or will the Xenomorphs be successful in turning the planet into a new nest? Who do you think will win?
Bonus question: how many Aliens can the guardians stop before they become facehugger food?