Space: 1999: Season 2, Episode 23

The Immunity Syndrome (29 Oct. 1977)

TV Episode  |   |  Adventure, Drama, Sci-Fi
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The arrival of the Alphans on another planet seems to cause a change in its atmosphere, setting off pollution and poisoning of the water. They meet Zoran, the sole survivor of the last ... See full summary »



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Episode complete credited cast:
Tony Anholt ...
Karl Held ...
Jerry Travis
Sam Dastor ...
John Hug ...
Hal Galili ...
Alibe Parsons ...
Walter McMonagle ...
Les Johnson
Roy Boyd ...
Joe Lustig


The arrival of the Alphans on another planet seems to cause a change in its atmosphere, setting off pollution and poisoning of the water. They meet Zoran, the sole survivor of the last exploratory force, who tells them that the planet is controlled by an immortal being - with whom Koenig must parley if he and his crew are to leave the planet alive. Written by don @ minifie-1

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Release Date:

29 October 1977 (UK)  »

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Aspect Ratio:

1.33 : 1
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Guest star Karl Held joins Joan Collins as the only actors to appear on both this show and Star Trek TOS. See more »

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User Reviews

Slightly better than the typical season two episode.
25 July 2010 | by (Bradenton, Florida) – See all my reviews

To say that this episode of "Space: 1999" was slightly better than the typical episode of that season is faint praise indeed. After a very cerebral yet competently made first season, the show essentially 'jumped the shark'--making wholesale and mostly unwelcome changes in the shows. It's pretty obvious when you see a show in which season it appeared--not just because of cast changes but because the style, tempo and budget had changed so drastically. For the most part, season two was a dud and the show was summarily canceled. While I love sci-fi, it was an end well deserved.

This show finds some of the crew on the surface of what seems like an ideal planet for colonization. The water and air are clean and the place seems swell. However, inexplicably a couple crew members go crazy AND the once-clean water now has become toxic. And, next, the air becomes so corrosive that the metal on the Eagle is compromised. It looks like they are stuck on the planet until they eventually die or go crazy.

So far in the plot, I was hooked. The idea of a planet with an intelligence that begins an attack on them is pretty cool. Unfortunately, what happens next was just dumb. While they NEVER adequately explained in any way why the planet became so toxic, the going crazy part was inadvertently caused by an invisible being--quite unintentionally. This, combined with the 'we just want to be your pals' ending, made this particular episode that ended on a whimper after such a promising start sort of a metaphor for the series, actually.

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