David Warner guest-stars as Aldous Gajic, a futuristic "King Arthur" who has spent all his life searching for the Holy Grail. His arrival on B5 coincides with a plot hatched by Downbelow hoodlum Deuce (William Sanderson) to gain control of other people's minds. And what has all this to do with the erratic behavior of Ambassador Kosh? Written by Christy Marx, "Grail" first aired July 6, 1994, after nearly six weeks' worth of rerun episodes. ~ Hal Erickson, Rovi