I remember seeing a SciFi episode where one of the crew members on a spaceship becomes a monster; he realizes that but can't do anything about it. He got outside onto a planet and was hunted down and, I think, subsequently healed, when he got his original form back.

It must have been end of the seventies. Could also have been a repeat.

Is there a classic Star Trek episode that would fit?

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    This seems entirely too generic to identify, I'm pretty sure every long running scifi/fantasy series has done a variant of such a plot. The only significant narrowing characteristic is that he is able to leave the ship and get on a planet. – apoorv020 Jul 10 '11 at 17:39
  • When you say every series could you pinpoint the one from Star Trek TOS? Thank you – vonjd Jul 10 '11 at 18:31
  • There really isn't an episode of TOS that fits your description, so it must have been one of the other series or else some other show. – BBlake Jul 11 '11 at 16:43
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    In a comment on Tango's answer, you say that there was no TNG when you saw this particular episode. Maybe if you estimated the year it was on, then it would help. Also, when I see SciFi, I assume it's the cable channel, but it could also mean generic science fiction. You might want to edit the question to clarify these points. – jprete Jul 11 '11 at 21:16

Are you sure you're not talking about "Identity Crisis" from Star Trek: The Next Generation? In that episode, Geordi is infected by an alien parasite that alters his DNA and changes him into a creature that needs to return to its home planet. He can find out something about what's happening, but not in time to stop his mutation. Of course, the Enterprise crew figures it all out and undoes the mutation to his DNA so he is back to normal in time for the next week's episode.

  • I am pretty sure because at that time when I saw the other episode there was no TNG yet... – vonjd Jul 10 '11 at 16:46
  • Are you sure it was a continuing series, like Trek or Space: 199 or something and not an anthology like Twilight Zone or Outer Limits? Also, if you remember about when it happened, that might help. – Tango Jul 10 '11 at 18:30
  • Yes, it was definitely a continuing series and I thought that it was ST:TOS but nobody seems to remember this episode there. – vonjd Jul 10 '11 at 18:35
  • Can you describe the planet or the monster? Or about when it aired? – Tango Jul 10 '11 at 18:37
  • Must have been in the seventies and the monster was like massive rock, like a Hulk not green though, but more brownish or greyish. – vonjd Jul 10 '11 at 19:19

This also sounds like an episode from Stargate SG-1 from Season 2 called Bane. SG-1 travels to a planet that is apparently devoid of all visible and detectable life forms. Soon they discover the planet is swarming with bugs one of which stings Teal'c before being shot by Colonel O'Neill. When SG-1 arrives home Teal'c begins going through a process where his DNA is being re-written the end result being him a host for more of the bugs in larval form. He is cured by the end of the episode but not before going through excruciating pain etc.

  • Thank you. I guess the problem is that this episode was much later. – vonjd Jul 12 '11 at 5:42
  • Oh I know, just saying that's what it sounds like :P – zkriesse Jul 12 '11 at 15:48

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