King Arthur entrusts Sir Lancelot with a secret battle plan for Prince Boudwin. The Prince is besieged in his castle by King Mark and is badly in need of help. When Sir Lancelot and his squire Brian arrive to help they are captured and King Mark attempts to persuade them to reveal the secret information.

A cowardly knight wants to rescue a lady who is imprisoned by her brother. He comes to King Arthur, for advice on how to become courageous. Merlin instills confidence in the young knight by lending him Sir Lancelot's weapon and telling him it is a magic sword.