The Alien Nation Pilot TV film
Season two of Alien Nation was in the process of being written when it was cancelled. Below are links to the three unfilmed, season two episodes that had been completed prior to the show being cancelled. Ultimatum and One Nation: Invisible are unfilmed scripts that were discovered much later than the original three.
On Separate Ways (Unfilmed Script)
One Nation: Invisible (Unfilmed Script)
Dark Horizon (Unfilmed Script - Original Version)