To classify this show as a classic really does not to it justice. This show from start to end was a morality play on race relations. It allowed the writters to explore prejudice, and race hatered, in a format that allowed the viewer to accept the message if desired without the appearence of being preached to.
The "aliens" great and we came to love their taste for spoiled milk, raw rodent, and love of life. We learned to like spots, and appreciate that different is not bad.
I loved this show (the followup movies not so much)and I look forward to occasional "alien nation" movie that shows up from time to time.