Every episode started with film footage of Huck Finn, Tom Sawyer and Becky Thatcher pursued by Injun Joe. As the three children entered a cave to escape Injun Joe, they were caught in a time vortex that took them to a different place and time period. After they left the vortex, Huck, Tom and Becky were still live children, but they now interacted with animated characters, such as Hercules, King Arthur or Don Quixote.