Re: thats all, just plausable.
You can even make it exceeding dodgy and damn near implausible science, but when you do the character actions must be completely believable. When both are implausible at the same time the whole thing falls apart exactly as this episode did.
The very first episode of Dr. Who I saw was Tom Baker's Robot. I was flipping PBS by the PBS channel on a Saturday afternoon (back when you did it with dially things instead of digital remotes) and it caught my eye. It was well into the episode and practically ended. I watched it to the end. It was incredibly campy with incredibly bad special effects but wonderfully acted. And I dutifully sought it out on the schedule so I could watch the next episode. PBS was blocking it so I could watch all the parts of a show at once.