Doctor Who never scared me - it thrilled me! Even as a child I watched it without feeling the need to leap behind the sofa. Instead I revelled in all those monsters and slime and robots and everything else. Yet I think that one of the scariest moments in any iteration of the programme is the end of episode one of this story when we see a Zygon for the first time. It is something to do with the fact that, as well as the appearance of the creature being grotesque anyway – a cross between an embryo and a sea horse- it has its mouth wide open and Sarah’s scream is given a slight echo and mixed into the end sting when the theme music starts. Somewhere in the land of What-if there is a period of Doctor Who called the Banks Stewart Era when the writer Robert Banks- Stewart took over the series and every story was delivered with same brio as `Terror of the Zygons` and `Seeds of Doom`. It would be full of hard action, vicious antagonists, quirky characters and lashings of richly swirling Geoffrey Burgon incidental music. In the event though we have just ten episodes with these ingredients but they do stand out even from their much admired fellow stories this season. Unbelievably `Terror` was supposed to end season twelve - can you imagine this story being shown in the summer?

