 He sacrificed three panels of his skirt to create the lightning conductor of the Empire State Building, and also served as the Cult's contact to Mr. Diagoras.In the climax of "Evolution of the Daleks", Thay dismisses the warnings of the Hybrid Dalek Sec and kills him.Moments later, Thay was destroyed (along with Dalek Jast) when the Dalek Human hybrids rebelled against the orders to kill the Doctor and opened fire on the Daleks instead.