The situation the characters find themselves in is very scary, and the monster is the best of the second season. That swimming through the sand effect has inspired numerous imitators over the years (most notably with the "Tremors" movies), and they do a good job of creating a genuinely creepy atmosphere in the scenes set on the planet surface. Not a great script, but "Invisible Enemy" still works.
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I really don't like to get picky on an episode of one of my favorite shows, but in 'The Invisible Enemy' they make the statement that it takes exactly 3 1/2 minutes for transmissions to get to Earth from Mars, yet later, when Adam West is talking back and forth to Earth, there is no delay at all.
I agree with you on 'Tremors'. I have always thought that it was based on this episode also. Every time I watch the episode I can't help but see Rudy Solari yelling 'Behold, a God who bleeds' from the episode of Star Trek that he was in.
Right now I'm watching the 'Expanding Human' episode, which has 3 Star Trek veterans in it. James Doohan, Skip Homier, and Keith Andes. I think the two shows shared quite a lot of actors.
Invisible Enemy is a good episode. But I noticed that when the rocket landed on Mars you could see the Earth behind lunar mountains and that the astroauts could breathe on Mars without their helmets on. I enjoyed the episode though and thought the killing creatures were cool. You have to remember in the 60's we had to wait once a week to get scared, we didn't have 600 channels like we do today.
The second expedition has two (2) tech improvements. - The computer analyzer - A new laser communication system that allows instant messaging from Mars
Sure - the radio is pure BS, but it's one of the few times in sci-fi when astronauts go into a dangerous situation, take a more cautious approach and have both the command structure and computer feedback to help them out.
That's pretty cool!
Americans...the first thing they put on a spaceship is the GUN LOCKER.