Jack Watling makes his first and last appearances in the series as Professor Edward Travers in the serials The Abominable Snowmen and The Web of Fear. Watling would go on to reprise his role of Travers thirty years on in the spin-off direct-to-video film Downtime.
Victor Pemberton was script editor for The Tomb of the Cybermen, with Peter Bryant as producer. After this Bryant resumed his role as script editor with Innes Lloyd as producer until The Web of Fear where Bryant took over as producer and Derrick Sherwin replaced Bryant as script editor. The Enemy of the World was the last serial seen under Head of Drama and creator Sydney Newman, who left the BBC after his contract expired in 1967.
Two serials, The Tomb of the Cybermen and The Enemy of the World, are complete in the BBC's archives; these are also the only complete serials from the first two seasons of Patrick Troughton's tenure as the Doctor. The two missing episodes from The Ice Warriors have been recreated in animated form for the DVD release of that story, in a similar fashion to Season 6'sThe Invasion. The Web of Fear was first released on DVD in 2014 with a Telesnap reconstruction of its missing third episode. On 16 August 2021, a Special Edition DVD/Blu-ray was released in with the missing episode now animated.[1][2]
Fury from the Deep is the most recent serial that is completely missing, with no episodes in the archives. All other serials in this season are at the very least partially preserved. Fury has also, however, received an animated recreation of all six episodes for a Blu-ray and DVD release.
The Enemy of the World saw Patrick Troughton playing both the Doctor and the villainous Salamander; this was the first time that the lead actor had played both his regular part and the part of the villain since Season 3's The Massacre of St Bartholomew's Eve.
On taking Victoria on her first trip away, the TARDIS crew arrives on Telos where they find an expedition excavating the tomb of the Cybermen. Inside the tomb, they find small metal creatures, traps and dozens of frozen Cybermen who are soon to awake.
The TARDIS crew arrive on a cold and windy hillside within the Himalayas. After exploring, the Doctor—wearing an extremely furry coat—is mistaken for what they think could be a Yeti. It turns out that the Yeti already roaming the mountains are robots created in hope for The Great Intelligence to reach material form.
In the distant future, the crew at Brittanicus Base struggle to control an ioniser, which they are using to slow the progress of glaciers rolling over Britain. A creature found in the Ice is taken back to the base, kidnapping Victoria once thawed and taking her to awaken his race from the glacier, which identify as Ice Warriors from the planet Mars.
Arriving in Australia in 2018, The Doctor finds out he has an evil doppelgänger named Salamander, a Scientist and Politician, who plans to rule the world with volcanoes. Despite those who follow his ultimate reign, the Doctor impersonates him to gain full access to his research station and reveal him for who he really is.
Avoiding a web-like substance from space, the Tardis lands in the London Underground. But when they find that the Yeti are suddenly running the system, chaos occurs for everyone, even the military. The Doctor, with the help of the military, tries to stop them invading the London Underground.
The TARDIS lands in the North Sea off the eastern coast of England. The Second Doctor, Jamie, and Victoria investigate a nearby beach where there's something nasty in the pipes. A refinery base takes them prisoner and it's soon to reveal that a parasite had been sucked up from seaweed and is taking mind control of those who come in contact.
Ainsworth, John, ed. (2019). "Shada, Dimensions in Time, The Curse of Fatal Death and Time Crash". Doctor Who: The Complete History. 90 (90). London: Panini Comics, Hachette Partworks. ISSN2057-6048.
Smith, Paul (2014). The Classic Doctor Who DVD Compendium. United Kingdom: Wonderful Books. ISBN978-0-9576062-2-7.
Smith, Paul MC (July 2021). Based on the Popular BBC Television Serial. Wonderful Books.