{{Infobox Character
=Scotland, United Kingdom
=Royal Scots Regiment member
=Desmond's friend
=Darren Keefe 

'''Billy''' was a member of Desmond's regiment in the Royal Scots. Desmond confided in him when he had unexplainable Desmond's flashes, and Billy thought that he was simply pretending to have mental problems to get thrown out of his Regiment. {{crossref}}
* ''Billy'', short for ''William'' comes from the Germanic name ''Wilhelm'', which was composed of the elements wil "will, desire" and helm "helmet, protection".
* During casting for {{ep}}, he was described as "Mid to late 20s, Caucasian, British, a good buddy to have, willingly to listen but won't take too much guff before he'll knock you in line... ''Nice co-star. impeccable British accent''".http//
* "The Constant" is modeled after Kurt Vonnegut's book ''Slaughterhouse Five'' The main character in ''Slaughterhouse Five'' is named Billy Pilgrim. Chapter Two begins "Listen Billy Pilgrim has come unstuck in time"


CategorySeason 4 characters
CategoryCurrent or Former Military
CategoryFlashback Characters
CategoryDesmond's flashback characters
CategoryBritish characters
CategoryEpisodic characters