Day 648: The Trial of a Time Lord Part 9 - Terror of the Vervoids Part 1

The interesting thing about this story is the way in which it is told. The eponymous trial that the Doctor is undergoing is using evidence from the Doctor's adventures, with the previous two being taken from his past. This adventure, however, bucks the trend and chooses to go for an adventure from his future. We thus get a new companion, Mel, who we've never met before (and indeed will never properly 'meet'; we will never get a 'proper' introduction story for her character), as well as a few other things, such as a calmer temperament for the Doctor, showing that his character has evolved since the time which the trial has taken place.

But more than that, it also shows how the production team have chosen to take advantage of the format of the overall story arc. Instead of just confining themselves to the events of the past, they have decided that, since this is a show about time travel, they can nip into the future and tell a story that way. Granted, aside from the addition of Mel, there's not much to distinguish it from any other story that could have been told, but it's the thought that counts, and I appreciate this story for that fact.