Doctor Who was first broadcast in 1963. It went on to become the longest running science fiction programme on British television.
It was thought up by Sydney Newman, the BBC's then Head of Drama, who wanted a family adventure series for Saturday tea-times.
In those days it was shot in black and white.
In the very first episode (23 November 1963), two schoolteachers follow one of their pupils, Susan, back to a junkyard where they find she lives in a police box with her grandfather, the Doctor.
They force their way in to the Tardis and are plunged back in time to the Stone Age.
The following story introduced the Daleks for the first time. They were an instant hit and the rest is history...