The series was pitched in a single day to ABC, CBS and NBC. Fox was avoided due to the concept's overt similarities to their hit series "The X-Files." Each network received a classified "briefing book" written by Zabel and Friedman, wrapped in plain brown paper, which warned that by opening the package they accepted the high level clearance it implied and the full penalties set by the U-S government for unauthorized disclosure. By the end of the day, two offers had been made, and the series went to NBC.
The 2-part pilot episode, "The Awakening" (first shown on network TV, NBC - 21 September, 1996), has been made into a single, feature length movie and is now being shown on cable TV under the title "Dark Skies" (1996).