The thirteenth season of British science fiction television series
Doctor Who began on 30 August 1975 with the story Terror of the
Zygons, and ended with The Seeds of Doom.Tom Baker continued his role
as The Fourth Doctor along with Sarah Jane Smith (Elisabeth Sladen).
Harry Sullivan, played by Ian Marter, departed in Terror of the Zygons
and reappeared in The Android Invasion as a guest star.Nicholas
Courtney returned as Brigadier Lethbridge-Stewart in Terror of the
Zygons having last appeared in Robot. John Levene makes his final
appearance as Sergeant Benton in The Android Invasion after six years
in the role. Doctor Who (season 13) Biography, NetWorth, Height, Age, Weight, Family, Married, Son, Daughter