Outro: Who are the Zygons? What covert operation are they instigating on the Earth? Should they be permitted to exist? The most remarkably tolerant and merciful among us may be content to let Zygons be Zygons. But some will think otherwise when they unleash their terror on our very own planet, just off the coast of Scotland, next Sunday night at 11. [source: ChicagoEpguides]