A sudden darkness with howling winds sweeps over you and when it passes, you find yourself in England, 926 A.D. — the time of King Arthur.
Without warning, the heavens part, a blinding light envelops you, and a deep bass voice appropriate for a scene of divine revelation such as this says to you, "Your quest is to find the Holy Grail, most noble knight!"
The voice continues, "You will face the many deadly perils that lie ahead, but you will also have many allies, such as Sir Launcelot the Brave, Sir Galahad the Pure, Sir Robin the Not-Quite-So-Brave-As-Sir-Launcelot and the rather aptly-named Sir Not-Appearing-In-This-Adventure."
The voice concludes, "You must find the Holy Grail or you shall never see the Master Diskette again! I bid you good luck and farewell!" And with that, the heavens close with a clang.