Princess Guinevere worries that her nostrils might be slightly imperfect and King Arthur and Merlin travel to a Wizard's retreat to retrieve a magic mirror known as 'The Bride's Reflection'. But Arthur accidentally uncovers 'The Black Heart of Doom' - a mirror which releases an evil Merlin bent on destroying Arthur. To save the King's life, the good Merlin sends Arthur back to the past where he meets the young Arthur. Together they face the trickery of young Launcelot and the power of the black-hearted Merlin in order to rescue their future bride - the baby Princess Guinevere.