Logan's Run is such a 70's scifi movie, but hey, Farrah Fawcett. Richard Jordan acted in this film and my favorite role he played was the Secretary of Defense in The Hunt for Red October "When I'm not kissin' babies, I'm stealing their lollipops."

I watched The Quiet Earth in a theater when it first came out. Great flic! Thanks for reminding me to watch again

Maybe also Night of the Comet, less the occasional zombie.