It was a genius idea revolving an alien menace around the ancient suspicions of astrology. Plenty of recognisable folklore for Gareth Roberts to tap into. The idea of a washed up astrology reader gaining real powers and taking over the world is delicious. Two stories in and this gang of Rani, Luke, Clyde and Sarah-Jane feel iconic. The show has reached its ultimate form. The only quibble I have with this story is that it's another mass-hypnosis number, but to be fair, it's carried off far better than The Christmas Invasion.