Tom and Huck go to see the unveiling of an experimental airship...only to be kidnapped by the ship's murderous inventor, who plans to fly around the world and then crash in flames - taking Tom and Huck with him! When the madman falls overboard in an Atlantic storm, Tom Sawyer and Huck Finn are trapped on an out-of-control airship, headed through the dangers of the ocean, toward the perils of the endless Sahara!