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I can tell you about the hook for a planet-hopping adventure in my current campaign.
You sure heard of all those mightily powerful abominations, dwelling in alien worlds and black voids between the stars? Well, one group of them decided to stop playing around, because there is a thing on your planet they want to secure - and securing it will mean disposing of the current population. They are bringing serious firepower with them, enough to certainly overun any single planet, even if creatures living on it somehow form a united front. But thankfully you still have some years, while their invasion planetoid is decelerating in normal space, because they want the planet itself intact. Go on an interplanetary adventure too see if these bastards have any rivals and enemies, who can be recruited to help you, out there in the wider galaxy.