i give this set a 4 only because the second season of this fun show from my childhood, was not very good.the science was off but the show was fun and much more intense than most sci-fi shows. martin landau and barbara bain are the leads in this story about the moon being blasted out of orbit of the earth and sent like a spaceship into outer space. some great f/x and some good stories the first season. then someone tried to fix what wasn't broken and they re-tooled the show for the 2nd season and blew it. they cut cast members changed the sets and never offered and reason or told what happened to the people who left. plus to cash in on the spock/alien angle they added an alien woman who can change into any living thing she wants to. all in all though this is fun to watch the disc look great