Captain Jonathan has a peaked cap and a smart navy-blue uniform. He is the captain of a ship -- not a very big ship, but a sturdy little tugboat called Santa Maria. Captain Jonathan helps all the other ships start their journeys to distant lands, until one day he can no longer resist the impulse to see the world himself. Captain Jonathan sets sail, but somehow the voyage doesn't live up to his hopes and dreams. And while the cabin boy Luke tries everything...