The only one to watch is the first one. Skip all the others. They add nothing to anything. But the first one is cool. Just remember when watching it that when it came out, the TV show didn't exist, so the concept of a hero who kills his opponents and takes their life force was brand new. A villain doing this would have been par for the course. But a hero? This had never been seen before.

Also the scenery is beautiful, the songs by Queen add majesty, and Sean Connery is brilliant, as is Clarence John Brown III, who plays the Kurgan.