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

Previous Story: The Ribos Operation

This is such a good story on so many levels, to start, it's written by Douglas Adams, who gives these 4 parts a very distinct style from what Doctor Who has had to offer so far. The clever sci-fi concepts mixed in with surreal, witty dialogue make for one of my favourite 4 parters yet.

The concept of a planet that mines other planets by teleporting around them is fascinating and makes for a puzzling mystery that leads into a great cliffhanger. The conversations are all very entertaining to watch unfold and it gives the usually shallow side characters a life of their own. All this is generously helped by the incredible supporting cast, especially Bruce Purchase's "Captain". Tom Baker also gets a change to show off his range as the Doctor.

Just a solid story all round and an all-time classic.

Next Story: The Stones of Blood