With this being an episode dealing with the TARDIS as the enemy, I chose to use music more electronic sounding, so Forbidden Planet seemed like a nice addition. I also felt like there were some plot holes on why Susan went nuts earlier on in the episode.
Intentions:
This was a WEAK episode, so I tried to eliminate some of the plot holes and make more interesting and eerie with the use of electronic music from Forbidden Planet.
Change List:
Too many to remember, but lots trims here and there.
Additional Notes:
Big change is that Susan doesn't go completely nuts until we understand that they are suspecting Barbara and Ian as tampering with the TARDIS.