When the Doctor, Polly and Ben search for a human colony that appears to be one big holiday camp, they think they have come across a truly happy place. But a shadowy existence soon makes them realise that the surface contentment is thoroughly managed. The colony’s inhabitants have already been brainwashed by large crab-like creatures – the Macra. Insidious propaganda, broadcast with the Controller, forces the human beings to mine a gas that’s needed for the Macra to survie – but fatal to them. The colony should be saved – but how? The Doctor and his team are up against it, particularly when Ben falls under the influence of the Macra. Can he end up being rescued using their bad clutches? Can the gas pumping end up being destroyed, getting rid of the Macra for good? The soundtrack to the popular adventure, that was 1st broadcast in 1967, continues to be digitally remastered to recreate a very popular story through the Troughton era.