FBI SWAT agents arrive at the hotel and capture the bombers. Mulder later questions human nature and their beliefs, but then hears a loud sound of trumpets, suggesting it is the voice of God. This episode features the return of The Lone Gunmen (portrayed by actors Tom Braidwood, Bruce Harwood and Dean Haglund) which had been announced in July 2015. Since the characters had been killed off in the ninth season, it was unknown how their characters would appear. Chris Carter explained that he would not reference "The X-Files" season 10 comics where The Lone Gunmen faked their deaths. The Lone Gunmen's appearance was nearly cancelled when casting agents were unable to find Dean Haglund after he moved to Sydney, Australia. Haglund learned of the search from Bruce Harwood at a convention in Connecticut. In the episode, they appear in Mulder's hallucination. The casting of Lauren Ambrose and Robbie Amell as Agents Einstein and Miller was also announced in July 2015. Eric Breker, who plays Agent Brem in this episode, previously appeared as several different characters in various episodes, including "Apocrypha", "Demons", "Emily" and "Christmas Carol". In its initial broadcast in the United States on February 15, 2016, it received 7.07 million viewers, a decrease in viewership from the previous week of 8.31 million viewers. "Babylon" was met with mixed reviews from critics, and was faced with controversy over accusations that the episode was Islamophobic in its negative portrayal of Muslims and Islamic beliefs. On Rotten Tomatoes, the episode received a 69% approval rating and an average score of 6.54/10. The consensus reads: "The sloppy 'Babylon' represents an unfortunate stumble, but Mulder and Scully's interactions still offer fans enough incentive to tune in." Keith Uhlich, writing for "Vulture", gave the episode a 4 out of 5 rating and stated that "On first glance, I found the whole affair aggressively unpleasant, but a second viewing snapped me around to overwhelmed admiration. The truth is surely somewhere in between". Zack Handlen of "The A.V. Club" awarded the episode a "B" and wrote: "Wanting to believe is maybe the most powerful drug there is, and it can work chaos or miracles, or something in between. At its best, "Babylon" is somewhere in between those two poles".