 Showrunner and writer Manny Coto explained that the " demons " in the episode refers to the demons of intolerance that humanity must defeat before they can form the United Federation of Planets . Colonel Philip Green ( the leading villain of World War III in the Star Trek universe ) was originally intended to appear earlier in the season in the episode " Borderland " but the episode was instead re @-@ written to feature Arik Soong after The Next Generation actor Brent Spiner became available ; Green 's appearance was one of several included in season four which linked Enterprise to The Original Series , which included the Mirror Universe and Gorn in " In a Mirror , Darkly " , Organians in " Observer Effect " and the Orions in " Borderland " and " Bound " . 
