It wouldn't be an exaggeration to say that the original version of Outer Limits should be hailed as one of the best science fiction based series ever done for television. Each episode was built around a plot rooted in science fiction that ranged from aliens coming to Earth to the interaction of people from the future with the present and so forth. The writing for the series was top notch with solid pacing and great acting in virtually every episode.
There are many episodes this reviewer could recommend starting with ' Demon With a Glass Hand', an award winning episode written by legendary science fiction author Harlan Ellison. Other episodes that are very good to watch include ' Don't Open Till Doomsday ', ' I, Robot ', ' Architects of Fear ' and ' The Invisibles'. The only flaw that the show has is that the producers were somewhat limited in budget which means some of the aliens/monsters you see are dated compared to the present day shows. However, this does not affect the enjoyability of the episodes to any great degree and is quite forgivable.
To conclude, this reviewer highly recommends this series for fans of science fiction as well as anyone looking for something that is thought provoking and plain fun to watch.