In the sequel "The Web of Fear", aired in 1968 and set forty years after "The Abominable Snowmen", the Great Intelligence returns when a control sphere is activated and enters a Yeti. The Great Intelligence uses an army of Yeti to take over the London Underground and begins filling London with a Web. The Great Intelligence primarily possesses the mind of Staff-Sergeant Arnold (Jack Woolgar) to sabotage the military resistance to the Yeti invasion. The invasion is revealed as a trap designed to draw in the Doctor so that the Great Intelligence can drain the Doctor’s mind, but it is again defeated and banished.