When he arrived on Earth the Doctor's adventures took a rather new direction. Not only was the Doctor now played by another actor, Jon Pertwee, but his adventures were also broadcast in colour. This was something helped by his exile on 20th Century earth, as the lack of intergalactic travelling meant that episodes were now cheaper to produce. He also became an advisor to UNIT, drove a car named Bessie, and alongside the Brigadier was joined by one of his most short lived companions, Liz Shaw, who stayed with the show for only one series.
1971
Not only was the character of The Master introduced in this year, but he was brought in in a way that that was different to the Doctor's other adversaries; essentially a Moriarty type figure, he appeared in all five serials of the eighth series. Although longer story arcs are something modern audiences are more than used to, this was a first for Doctor Who, and would remain unique until 1978. The Master was eventually apprehended in The Dæmons, but like any true Doctor Who villain it wouldn't be long before he would return.
1972
As if feature films and annuals weren't enough, this year would confirm Doctor Who's place as more than just a TV show with two more releases that allowed fans to keep their love for the series alive between Saturday evenings. The first was the non-fiction book The Making of Doctor Who, which as its title suggests, gave audiences a glimpse into the show's production. The second was the single Who Is The Doctor?, a rearranged version of the iconic theme tune, which featured the spoken voice of Jon Pertwee reciting verses that describe the Doctor's otherworldly nature. Also broadcast this year, on 30th December was the first episode of The Three Doctors. Not actually the tenth anniversary serial that many believe it to be, it was in fact merely the first serial of the tenth series. That being said, as you can probably guess by the broadcast date of episode one, the majority of the story was indeed broadcast during the show's tenth anniversary year.