It is... forbidden.

I watched Forbidden Planet a couple nights ago. Turns out I'd seen a big chunk of it before on TV or something without realizing it. It was an odd B-class sci-fi flick. On that list I linked to about the best Shakespeare films it's on the list as version of The Tempest. I'm not familiar enough with that play to know if it's at all a faithful adaptation, but it was still a fun movie even if the ending was rather obvious.