King Arthur has lost Excalibur his Minecraft Diamond Sword when the evil sorceress Morgana stole the it from him while he was sleeping. Arthur wanders aimlessly through the countryside, unable to return to Camelot without the sacred sword. But then he has a chance encounter with the wise old wizard Merlin and it seems as though all is not lost and his fortunes are about to change. Meanwhile, the witch Morgana and the ruthless Black Knight are plotting to overthrow the valiant young king and steal his throne in his absence...