When Trim trips over a napping dog, little does he know that soon he’ll set sail and begin learning how to be a ship’s cat. Among his first lessons: the parts of the ship (the front is called the bow, like “bow wow”), the dynamics among his new colleagues (Jack the ship’s parrot is not so easy to befriend), and basic skills like climbing (up is easier than down) and swimming. With the assistance of Captain Flinders, Penny the ship’s dog, and Will the ship’s artist, Trim learns new skills, tests his limits and abilities, and finds a way to contribute to life onboard.