Picked this up cheap on DVD recently. It's been many years since I've seen it but it's still surprisingly good despite time obviously overtaking much of the technology on display(it ran from 1970 - 1973). It's also interesting watching these old shows just to see how many times people are stuffing cigarettes into their mouths. It's revealed in the first episode that the aliens might be coming to Earth to harvest organs but I don't think they'd be very interested in human lungs from this time period.
I think I prefer this to Space 1999.
So, if you're looking for something entertaining from yester-year, give this a try
I think I prefer this to Space 1999.
So, if you're looking for something entertaining from yester-year, give this a try