But what were the shows at the time that Doctor Who was closest brethren/competition with, or seemed to be inspired by or aspiring toward, or where an unavoidable mirroring seemed to be going on?
I'm going to take a stab at this.
Pertwee era: Quatermass, Captain Scarlet.
Tom Baker era: Survivors, Count Dracula
Peter Davison/Colin Baker era: Blakes' 7, Terrahawks
Sylvester McCoy era: Treasure Hunt, The Comic Strip Presents...., The Girl From Tomorrow
What say you?