Episode 57 of "Babylon 5"
s03e13 A Late Delivery from Avalon
Title: A Late Delivery from Avalon
Original Air Date: 04/25/1996 on Syndication
Director: Mike Vejar
Writer: J. Michael Straczynski
Guest Stars: James Kiriyama-Lem (Med Tech), Michael Francis Kelly (Security Guard #1), Michael Kagan (Emmett Farquaha), Roger Hampton (Merchant), Dona Hardy (Old Woman), Robert Schuch (Lurker), Jerry D. O'Donnell (Security Guard #2)
Plot Outline:
A mysterious man comes to Babylon 5 dressed in chainmail and armed with a sword. His name? King Arthur - Son of Uther Pendragon, come to help when he is needed most.