It'd be like this...So the crew never encountered them? what about tonik?
When the team got news of the incoming attack, they prepared the defense around town ; Galaxy went out into space in her eldritch cosmic form (normal-sized, not earth-sized) to check the situation, and met the crew out there. They asked her to summon "the creator", but she refused, saying that they could only meet him once the attack was over, and telling them not to get in the way because no-one would be responsible for friendly fire. On her return back to earth, she only told Tonik about this in secret, not wanting to tell the others and possibly cause panic, paranoia, etc.
Now the townspeople are standing their ground ready to fight, and the crew can choose to help with what they can from outer space, or simply get out of the way.