My dad didn’t like too many TV shows but he watched this one every week. I thought it was pretty good at the time.
One of the things I liked about “The Invaders” was they burned up when they were killed.
Roy Thinnes mentioned in one of his commentaries on the CD’s that the invaders were a little too easy to kill but people sort of accepted that since they were in a strange world in which they had to undergo constant rehabilitation in those chambers to stay alive and keep their human form.
Of course their ultimate plan was to change the earth’s atmosphere to match their own. There also was the occasional invader who did not approve of what they were doing.