THE GRAIL AND THE SAUCER - ROBERT MANIS

Torn between factions in King Arthur's Court where he must choose between the King, Sir Lanslod and the usurper Mordred an accidental time traveler materializes as a (sigh) Jewish knight at the Oval Table, whose few allies are Mirgan the Witch and two stoner Venusians, and must decide whether to return the stolen Holy Grail to avoid being burned at the stake or risk being stranded where the food is even worse than modern day England.