However, The Abominable Snowmen, The Ice Warriors, The Web of Fear, and Fury from the Deep have had their missing episodes reconstructed using animation.

Patrick Troughton, Frazer Hines and Deborah Watling appear as The Second Doctor, Jamie McCrimmon and Victoria Waterfield respectively.

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.

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.

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's The Invasion.