Played by: Jon Pertwee
Significant contributions to the Whoniverse: Firstly, and most clearly, the advent of the Third Doctor was also the advent for colour in Doctor Who. Hence, this post as well will be more colourful than my First Doctor and Second Doctor summaries. In addition, this Doctor remains on Earth for the majority of his tenure, as a result of the ruling of the Time Lords. This does not stop him continually trying to fix his TARDIS though, while helping UNIT on a fairly regular basis. The Third Doctor does get a regular nemesis, in the form of The Master, another Time Lord that will remain a thorn in his side right up until modern times. Roger Delgado played the character during the Pertwee era. New recurring aliens were also introduced, including the Silurians, the Sontarans, and the Autons. For the first time, a Doctor also had a phrase that for perpetuity is recognised as being unique to this regeneration; “Reverse the polarity”. Pertwee was still playing the Doctor on the shows tenth anniversary. Hence, he had the honour of being the lead Doctor in the series on the first occasion when his predecessors all appeared on-screen with him. Sadly, this was to be William Hartnell’s last ever appearance on the show. Finally, the term regeneration is uttered for the first time, and it only took us the third regeneration to get there!!