David and Goliath.

Derek, Margo, and Moki jump through time yet again and find themselves lost. As they search for information, they are threatened by wild animals. A young shepherd arrives on the scene and rescues them. They learn that this shepherd just happens to be the future King David. They follow David to Jerusalem, where they watch as he tries to help mend Saul's ill temper. Finally, they witness the defeat of Goliath.