 Although not strictly a missing serial, production of the 1979 Tom Baker story Shada was curtailed by a technician's strike partway through recording. To prevent the half-finished material from being junked, incoming Doctor Who producer John Nathan-Turner placed a preservation order on it with an intention to later finish the production. Although repeated attempts to remount the serial failed, a clip from Episode 1 was later used in the 1983 story The Five Doctors after Tom Baker declined to reprise his role.
