Demons (Star Trek: Enterprise)

"Demons" is the twentieth episode of the fourth season of the American science fiction television series Star Trek: Enterprise, and originally aired on May 6, 2005, on UPN. The episode was written by showrunner Manny Coto and directed by LeVar Burton. "Demons" is the first part of a two part story, concluding with "Terra Prime".

Set in the 22nd century, the series follows the adventures of the first Starfleet starship Enterprise, registration NX-01. In this episode, the crew returns to Earth to participate in a conference to set up a trade coalition of alien races. While there, they discover a plot involving a xenophobic human organization called "Terra Prime".

Peter Weller, who later appeared in Star Trek Into Darkness (2013), guest-starred as John Frederick Paxton, and other guest stars included Harry Groener, who had previously appeared in episodes of both The Next Generation and Voyager. Filming of the episode overlapped with that of several other episodes, and sets included both the standing sets and an alleyway on the Paramount lot which was previously used in the Deep Space Nine episode "Little Green Men". The critical response to the episode was mostly positive with one reviewer stating that the two-part story posed similar ideological questions to those seen in The Original Series.