As the TARDIS crew try to escape the Time Lords in Episode Ten, brief clips from
The Web of Fear and
Fury from the Deep are used to show the TARDIS in locations supposedly out of the Time Lords' reach. A model shot from Episode 1 of
The Wheel in Space is used after Zoe is sent back to her own time and place by the Time Lords. Since this episode is missing, the shot sampled in
The War Games is the only known surviving footage from this episode. Similarly, the shot of the TARDIS landing vertically on the sea is sampled from
Fury from the Deep Episode 1, which is the only surviving footage from this episode.
Casting Patrick Troughton's eldest son
David made his second appearance in
Doctor Who in Episode Six of this story as Private Moor, having first appeared in
The Enemy of the World (1968). He subsequently appeared as King Peladon in
The Curse of Peladon in 1972, and then as Professor Hobbes in "
Midnight" in 2008. Gregg Palmer previously played a Cyberman in
The Tenth Planet in 1966. Jane Sherwin who played Lady Jennifer Buckingham was producer Derrick Sherwin's wife. Terence Bayler had previously played Yendom in
The Ark (1966). Hubert Rees had previously appeared in
Fury from the Deep (1968) and would return for
The Seeds of Doom (1976).
Edward Brayshaw had previously played Leon Colbert in
The Reign of Terror (1964). James Bree later played Nefred in
Full Circle (1980) and the Keeper of the Matrix in
The Ultimate Foe (1986). Leslie Schofield later played Calib in
The Face of Evil (1977). Peter Craze had previously played Dako in
The Space Museum (1965) and would appear again as Costa in
Nightmare of Eden (1979). David Savile would later appear as Winser in
The Claws of Axos (1971) and as Colonel Crichton in "
The Five Doctors" (1983). Clyde Pollitt returned as a Time Lord in
The Three Doctors (1973).
Philip Madoc had previously appeared as Eelek in
The Krotons (1969), and the film
Daleks – Invasion Earth: 2150 A.D. (1966) as Dalek collaborator, Brockley. He would go on to play
Doctor Solon in
The Brain of Morbius (1976) and Fenner in
The Power of Kroll (1979). Bernard Horsfall (First Time Lord) had previously appeared as Lemuel Gulliver in
The Mind Robber (1968), and would subsequently play Taron in
Planet of the Daleks (1973) and Chancellor Goth in
The Deadly Assassin (1976). In 2003 he appeared in
Davros, a
Doctor Who audio drama produced by
Big Finish Productions. David Garfield later played Neeva in
The Face of Evil (1977) and Professor Stream in the
Sixth Doctor audio drama
The Hollows of Time. Vernon Dobtcheff later played Shamur in the
Fifth Doctor audio drama
The Children of Seth. ==Broadcast and reception==