nineteenth entry "Synchrony". However, after hearing rumors about American CIA agents left behind during the Vietnam War, he started to develop what would become the story for "Unrequited". The day before the show's 1996 Christmas break, Howard approached series creator Chris Carter and co-executive producer Frank Spotnitz and told them about his new episode idea. The project was green-lit, but Howard struggled with breaking the story, necessitating Carter heavily assisting him (thus their shared writing credits). Gordon had long been interested in writing an antagonist who could turn invisible, but he struggled with finding a scientific mechanism to explain this plot point. Eventually, Gordon discussed the struggle with his ophthalmologist brother, who told about blind spots in the human eye. Gordon noted, "These stories come from scientific research ... So I said, what if someone could actually create a field of vision where none actually exists?" Gordon decided to make the antagonist a Vietnam War veteran because "they are getting old, and like the Holocaust survivor [in] 'Kaddish', starting to die". This storyline also allowed Gordon the chance to give Vietnam veteran Walter Skinner a larger rolea chance that Gordon relished. The episode featured a replica of the Vietnam Veterans Memorial, of which only a portion was real (the rest being filled in with CGI). Due to legal restrictions, the replica featured fake names, chosen by the sister of art assistant Kristina Lyne; the wall also included the names of The X-Files cast and crew, as well as noted writer Harlan Ellison, and model Jessica Hahn. For day scenes, the replica and an accompanying grandstand were erected in Vancouver's Jericho Park due to the locale's "expansive, groomed, flat" characteristics, whereas night scenes were filmed in a large warehouse in Ballantyne Pier. This move required the production crew to dismantle and cart the grandstand from Jericho Park to the warehouse. The crowd used to film the memorial's reinauguration scene comprised 500 extras, who were multiplied in post-production with CGI technology. Fifty of these individuals had won the opportunity to appear on the show in local radio contests. Stanley Park doubled as Freedom Plaza. Because the park is public and operated by the Vancouver Park Board, city police cannot deny anyone access. This caused something of an issue when members of the paparazzi tried to photograph Anderson. Consequently, many of the available crew and production staff members formed a "human blockade", thereby