also substituted for the usual decor in the Ten-Forward lounge. While enlisted crew aboard the darker Enterprise wore variations of the Season 1–2 uniforms, the senior officers wore slightly modified versions of the uniforms introduced in Season 3. The Enterprise-C officers wore costumes from earlier Star Trek feature films due to the expense and time-consuming nature of creating more than a half-dozen or so new uniforms for the episode. Costume designer Robert Blackman's solution to change their appearance was to remove the turtleneck collars underneath the red tunics, as well as the belts, although the rear belt loop remained. Filming and casting Filming began on Monday, December 11, 1989, and lasted for seven days. The episode was directed by David Carson, who had only filmed one other Next Generation episode before "Yesterday's Enterprise". Carson felt that his relative lack of experience helped because he had no preconceptions about how episodes should be directed. Since much of the episode took place in the darker alternate universe, Carson wanted to emphasize the toll that decades of war had taken on the crew and the bridge. "Picard really looked tired and worn and like a battle-weary commander, and that's what we wanted the bridge to look like—a battle weary bridge. I had lots of thoughts about making it as strong as possible using a lot of low lights, a lot of dark blues, making it very much more moody", he said. To heighten the impact of the physical set changes, Carson took a different approach to how he constructed shots. "It was my intention to make it as much like a submarine as possible and to use low-angle lighting; basically, to do everything the opposite way that the Enterprise was normally shot." The cameras were equipped with longer lenses than usual in order to reduce the depth of the scenes and provide a grittier feel. The use of low angles forced the lighting to be modified to prevent the scene from, in Carson's words, looking "like a hotel lobby". Two new roles – Garrett and Castillo – needed to be filled for the production. The actors selected were both Star Trek fans. Christopher McDonald was picked for Castillo. "What impressed me about [McDonald]", Carson remembers, "was that he wasn't just your romantic leading man; he was actually a very impressive actor." Tricia O'Neil was cast for similar reasons; the actress was not the