Once upon a time, there wa a kitty named Gatsby. There was a second kitty named D. Gatsby was young, handsome, and everyone loved him. D was jealous of Gatsby... and hated how everyone fawned over cute little Gatsby. So one day, D tricked Gatsby and put him into a FedEx box that was post marked for Paris, France. This movie follows the tail of young Gatsby trying to make it out of the "City of Lights" as a young kitten in a big cat's world.

Based on episodes of the series "Moomin Stories", the Moomins reminisce about the fondest moments of their lives. Moominpappa reminisces about his childhood; Moomintroll reminisces about how he, Sniff, and Snufkin set out to find out if Earth was truly threatened by a comet; and Moominmamma reminisces about the incredible visit of aliens from outer space.