It's bad enough that, like a lot of Space: 1999 episodes, this one is a 15-minute story dragged out to 50 minutes. But what makes this one truly maddening is the characters' idiotic acceptance of an unbelievable situation: the sudden appearance of Dr. Helena Russell's long-presumed-dead husband on an Eagle--returning from, of all places, an investigation of an inhabitable planet. Dr. Russell accepts without doubt that it is in fact her husband, and (even more maddening) Commander Koenig accepts it, too. And of course this "person" is left unguarded in Medical: They're going to let him rest up and then question "him" later. (I mean, it's not like these people have ever run into any tricky aliens before, right?) A big chunk of the episode is taken up by this person engaging in the obvious nefariousness while the crew of Alpha remains oblivious. Of all forms of contrivance used by lazy script writers, the "stupid character" one is the most annoying, and this episode has it in spades. The only possible value in watching this episode is to see the stupendously bad ending. It's as if the writers woke up on the set after an all-night bender only 10 minutes before the end of filming and made up the ending right there on the spot. Other than seeing what has my nomination for Worst Episode Ending of the Entire Series, avoid this entry unless you're positively writhing-around-on-the-ground desperate for a Space: 1999 fix.