For some reason I have an image of some sort of jelly fish monster, a lighthouse, Tom Baker, and myself hiding behind the sofa.
What's quite funny is that my daughter loves it but refuses to watch ANY episode with the Angels in it, well not without me in the room. That's the way it should be :)
(Blink get's to me. Awesome writing.)
This must be Horror of Fang Rock, from 1977, written by Terrance Dicks under Robert Holmes as script editor. In 1974, when they held the opposite jobs, Dicks asked Holmes to give The Time Warrior a mediaeval setting, which he resented: so in good-natured revenge, for this script Holmes told Dicks he could write whatever he wanted, as long as it took place in a Victorian lighthouse. Since The Time Warrior has a Sontaran, Dicks decided his script had to have a creature who would be the opposite of a Sontaran, hence the jellyfish monster.
BTW the BBC program on the early days of Dr Who is amazing and the ending is properly tear jerking (Hartnels last recoding and he looks across and sees matt smith)