Well parallels have always been made between Star Trek and Forbidden Planet - but notwithstanding the obvious within this episode - there is another link.
Right at the beginning of the episode just as they are about to turn round and see M5 - there is a tiny extract of one of the electronic tonalities from the aforementioned film. You'll have to listen carefully - but it is there.
Either the producers didn't have enough money for their own effects or perhaps they were making an acknowledgement to the film.
Anyway it's a very good episode on par with many from the previous series.
Right at the beginning of the episode just as they are about to turn round and see M5 - there is a tiny extract of one of the electronic tonalities from the aforementioned film. You'll have to listen carefully - but it is there.
Either the producers didn't have enough money for their own effects or perhaps they were making an acknowledgement to the film.
Anyway it's a very good episode on par with many from the previous series.