The Invisible Enemy. This ep had Adam West as Maj. Merritt. He commands 3 other fellows on a mission to Mars. I feel that the reason the whole thing looks so fake right down to the studio walls you see that are supposed to be Mars' sky is I feel it is really just a test the men at the space agency are taking. One thing that always got me about this ep was you never see the door of the ship the men depart from or enter back into. If this was taking place for the men it would explain alot. See my other postings.