This is part of a series of reviews of Doctor Who in chronological timeline order.

Previous Story: Operation Werewolf

I love the way Classic Doctors New Monsters takes these one-off monsters and realises them to their full potential. They did it with the clockwork droids and now the Krillitane. Obviously a shape-shifter story isn't exactly anything new but it's brilliantly done here with us following the impostor TARDIS team for the majority of the story instead. It leads to a genuinely all-timer twist where you realise who we've actually been following the entire team. Troughton, Hines and Padbury's performances here were amazing in the way they suddenly flipped the switch like that. I'm excited to see the follow up to this one if it's anything as good as this.

Next Story: The War Games