Because this would have been prohibitively expensive, producer Robert H. Justman suggested that Ellison contain most of the action in a single structure when he went to script. Ellison agreed, realizing that by forcing the plot into an enclosed space, the change from a linear pursuit to a vertical climb, ascending as the action developed, would make for heightened tension. Most of this episode was shot in the Bradbury Building, the same location used for the final scenes of Blade Runner and a closing scene in the 1950 film noir classic D.O.A.