 The Thornberrys are in Africa near Mt. Kilimanjaro to film lions. Debbie pleads with her mom to let her drive the comvee while she films and Marianne reluctantly consents. Debbie loses control of the comvee and it falls down a muddy river bank. Before they can get it out a storm erupts and the comvee is washed away. That night while camping near the river Debbie goes off on foot in pursuit of the comvee while Eliza goes off in pursuit of her and Darwin and Donnie go off in pursuit of her. Soon all become prey to a lion and two lionesses. Eliza will have to outwit them all before they end up the main course.