Mulder. While familiar with the television series, Nowak decided not to review any episodes as preparation for his role in the production. Explaining this decision, he said, "I wanted the movie to be as fresh and new as possible in its design. Of course, there were some elements from the show that had to be retained." The design department found all their locations and designed sets in eight weeks, guided by input from the filmmakers. Nowak started by creating artwork for all the major sets and locations, working with the two concept artists Tim Flattery and Jim Martin. Nowak created drafts and sent them to Flattery and Martin who continued to develop them until they were complete. The complete artwork was then presented to Chris Carter, Rob Bowman, Lata Ryan and Sackheim for approval. While considering the time schedule, they made no notable changes to the artwork. Once the set concepts were approved by Carter, Bowman, Sackheim and Ryan, they were sent to the blueprint stage so that construction of the sets could begin under the supervision of construction coordinator Bill Liams. All the major sets were constructed "simultaneously" because of the schedule. However, this proved to be a challenge for the production team, because it meant they had to pay the rent on all the stages at the same time. The set construction started seven weeks before filming. Filming Carter and Bowman wanted to film in as many different locations as possible to give the film a "grander" feel than had usually been achievable for the television episodes. The tighter schedule, with only eight weeks of pre-production and 45 days of principal photography, still caused the production to have less location shooting than planned. Los Angeles ended up standing in for Dallas and London (though a shot was done in London with a double), and the ice scenes, initially envisaged for an ice field in Alaska, were moved to Whistler, British Columbia, nearby the show's regular locations in Vancouver. Principal photography for the film started on June 16, 1997. The X-Files was filmed in the hiatus between the show's fourth and fifth seasons and re-shoots were conducted during the filming of the show's fifth season. Due to the demands of the film shoot on the actors' schedules, some episodes of the fifth season did not revolve around both Mulder and Scully but just one of the two lead stars.