 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".
