The fourth season of British science fiction television series Doctor
Who began on 10 September 1966 with the 1st Doctor (William Hartnell)
story The Smugglers and, after a change of lead actor (Patrick
Troughton) part-way through the series, ended on 1 July 1967 with The
Evil of the Daleks. For the first time, the entire main cast changed
over the course of a single season (the only other occasion this has
happened is during Season 21). Only 10 out of 43 episodes survive in
the BBC archives; 33 remain missing. No serials in this season exist
in their entirety. However, The Tenth Planet, The Power of the Daleks,
The Moonbase, The Macra Terror and The Faceless Ones have currently
had their missing episodes (seventeen in total) reconstructed with
animation and subsequently have been released on home media.William
Hartnell appears as the First Doctor for the first two full serials
before being succeeded in the role by Patrick Troughton as the Second
Doctor for the remaining seven stories.Anneke Wills and Michael Craze
continue their roles as Polly and Ben respectively. They are shortly
joined by Frazer Hines playing Jamie McCrimmon in The Highlanders.
Polly and Ben depart in the penultimate story The Faceless Ones, and
at the end of the season Deborah Watling makes her debut as Victoria
Waterfield in The Evil of the Daleks. Doctor Who (season 4) Biography, NetWorth, Height, Age, Weight, Family, Married, Son, Daughter