The Macra Terror
3.42
When The Doctor, Ben, Polly and Jamie visit a human colony that appears to be one big holiday camp they think they have come across a truly happy place. But a shadowy presence soon makes them realize that the surface contentment is carefully controlled. The colony’s inhabitants have been brainwashed by giant crab-like creatures – the Macra. Insidious propaganda, broadcast by the Controller, forces the humans to mine a gas that is essential for the Macra to survive – but fatal to them.