The weakest serial of the season. Fun to watch, but kinda "meh" overall.
This story, only the second non-Dalek story from Terry Nation, is a riff on
Invasion of the Body Snatchers. Unfortunately...we
just had a body snatcher story a few serials ago. Still, this one is a bit creepier in spots...particularly the strong first episode and the replacement Sarah at the end of episode 2. The Kraals looked cool, but were kinda crap nonetheless. Oh...I should also mention that when Crayford discovers he can actually see out of his left eye after wearing an eyepatch for however long he has was just plain unbelievably stupid.
How could he not know he could see? Had he never thought to lift up the friggin' eyepatch??
Seriously? This was directed by former producer and occasional director Barry Letts, and featured the last appearances of John Levene as Sgt. Benton and Ian Marter as Harry Sullivan.