In August, it will be 50 years since the Zygons first squelched onto our screens in their debut adventure. Their leader, Broton, had been waiting centuries to claim Earth for his own people… Now it turns out his wasn’t the only line of attack: other Zygons also fell to Earth and have a plan of their own.

Producer Jonathan S Powell says, “The Zygons are such endlessly fascinating creations: shape-changers, unusually vulnerable to bullets and, despite their unnatural appearance, capable of the same humanity as we are. Each episode has its own unique genre, style and story, tackling a different year of our century-long Zygon invasion. What are the Zygons planning that will take them 100 years?”

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