"Gratuity Tucci and her alien friend, J.Lo, journey to New Boovworld, one of Saturn's moons, to clear J.Lo's name after a string of misunderstandings"--
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.