Andy is a toy tugboat who wishes for "bigger things" than sailing in the bathtub. The Man with the Polkadot Tie (who owns a toy store) and his son take Andy to a small brook in a pasture, and soon the current carries him away. At first Andy is pleased. The brook grows into a stream which turns into a small river and finally a larger river. Andy is overwhelmed by the sheer size of things around him. As he is just about to sail off into the endless ocean, he is rescued by the man and his boy and returned to the bathtub where Andy is now content to remain.