The movie was basically about a mystical duplicitous cat using humans to escape the city to get away from the aliens.
Moral of the story, cats will probably out live humans in the event of an alien invasion. Reason? Let's see...Cats move in stealth by nature, they're fast, flexi bones gets them thru tight spaces, actually CAN tolerate being in water, can roll up inside an alien's lair, sit on a ledge and watch them eat pod slime all judgy like - without any fear or detection.
Moral of the story, cats are clever and cayute. Other than that, it was a sappy story about friendship, not as scary as the other 2 movies.