The Tomb of the Cybermen is the first serial of the fifth season of the British science fiction television series Doctor Who, which was originally broadcast in four weekly parts on BBC1 from 2 to 23 September 1967. It is the earliest serial starring Troughton as the Second Doctor, as well as the only Cyberman story produced in the 60s known to exist in its entirety. It also introduces the Cyber Controller and the Cybermats.