Tommy Tott, an adventurous young boy, lives in a house with a stream behind it. One morning, Tommy sits beside the stream and wonders where it goes. If he were only very small, he could ride a raft down the stream to its end and see where it would take him.

As Tommy sits daydreaming, he suddenly finds his wish granted. He has become a very small boy riding a raft and headed on an incredible adventure downstream!

As he floats along, Tommy meets wildlife of all kinds'and they can talk! Not all of the insects and animals Tommy meets on his journey are friendly, however; one even wants to eat him! Can Tommy Tott stay safe on this exciting adventure? Will he ever get big again and find his way home?