Having decided not to go to bed because his home is too noisy, Nicholas flies his spaceship to the Moon, where he enjoys a snack, takes a moonwalk, and enjoys the quiet--until he realizes what he is missing at home.
When a group of rambunctious aliens comes for a visit, they swing in the trees, dance in the kitchen, and cause pure havoc in one little boy's quiet home.
When her mother is abducted by aliens on Christmas Eve (or "Smekday" Eve since the Boov invasion), 11 year-old Tip hops in the family car and heads south to find her and meets an alien Boov mechanic who agrees to help her and save the planet from disaster.