adventure featuring a mythical monster that (of course) is anything but supernatural

There's spoiler number one. I figured it was an EMH just after they got the the spaceship, but that's definitely a spoiler for the phobes.

Spoiler 2 is, of course "it's a bit shit, isn't it", which some people like to figure out for themselves.

Thing is, having watched it twice, it's a bit shit by current expectations, if this'd be a Davison/BakerC era story, it'd have been a triumph.