While the Dalek inventor Zeg is working in the inventions factory on strengthening Dalekanium, a fierce storm hits the Dalek city and a lightning strike damages Zeg's equipment. The ensuing explosion coats Zeg in the newly created metal. A team of Daleks brings Zeg to the examination chamber, where they find his casing stronger, but are concerned by his claims of invincibility. They fire at him but can't destroy him.