This is the complete 1955-57 series which combined science and science fiction to come up with what, for the time, were good shows.  They are a little dated now.  The "special effects" are not so special now.

This is packaged on 10 DVDs.  5 for each of the two seasons the show ran.  I saw much of this series as a kid and one of them really shook me.  Was good to see it later and find out how hokey it was and get that out of my brain!