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Michael Jayston, a Shakespearian actor, played an "intermediate" future incarnation of the Doctor known as the Valeyard, who existed between the Doctor's twelfth and thirteenth incarnations.
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TV editing was very difficult in the 1960s, and so (in common with most other British TV drama at the time) many early episodes of "Doctor Who" were recorded "as live". If the actors fluffed their lines, the others had to cover for him/her. There are several obvious instances of this in the series, such as in "The Web Planet" where actor William Hartnell forgot his lines, leading to co-star William Russell to prompt him by asking "What galaxy is that in then, Doctor?". In order to facilitate this style of recording, the actors were allowed a four-day rehearsal period (Monday-Thursday) followed by camera rehearsal on Friday day and the actual studio recording Friday evening. Saturdays were often spent on location recording inserts for future episodes, and the actors were given Sunday off before the process started again for the next episode on Monday morning. Although editing techniques improved over the years, it remained the case that studio scenes would usually be taped almost as live, using a multi-camera system, until the series ended in 1989.
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Two reasons are given for the first episode of the first series series being repeated the following week: a) it aired the day after John F. Kennedy's assassination and as a result drew lower than expected audiences. b) there was a widespread power failure and the episode was not seen nationwide.
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The distinctive TARDIS sound effect is officially classified as a piece of music and was created by rubbing the bass strings of a piano with a key.
