The last appearance of William Hartnell as the First Doctor, Richard Hurndall would play the First Doctor in _Doctor Who: The Five Doctors (1983) (TV)_ .
The last acting role of William Hartnell.
Early scripts concerned the 3 Doctors joining forces to combat various incarnations of Evil, including zombies and the goddess Kali, though this was modified after the poor health of William Hartnell prevented him from playing a more active role. Other suggestions included a role for Frazer Hines reprising Jamie McCrimmon (which was abandoned as he had prior commitments to "Emmerdale Farm" (1972)) and a possible cameo for Wendy Padbury as Zoe Herriot.