Jon Pertwee's era of Doctor Who took a lot of inspiration from the spy genre, so it is hardly surprising that producer Barry Letts decided to add a Bond-style villain in the form of the Master. What is surprising is how long it took them to do it. The Master wasn't introduced into Jon Pertwee's second season in the role in 1971's Terror of the Autons. As we all know, the character became a big hit with audiences and has gained the status of one of the Doctor's most iconic enemies.

When the Master (Roger Degaldo) arrives on Earth in his TARDIS, he steals a Nestene meteorite and hooks it up to a radio telescope in order to boost a frequency wave that will bring to life the plastic of Earth. Meanwhile, the Brigadier (Nicholas Courtney) introduces the Doctor (Jon Pertwee) to his new assistant Jo Grant (Katy Manning). At first, they don't get on due to Jo's clumsiness and lack of scientific knowledge however over the course of the story they become firm friends and the Doctor starts to accept her as his companion. Together they must stop the Master from summoning the Nestene and destroying humanity with an army of Autons.

Whilst the first story to feature the Autons - Spearhead From Space - focused entirely on shop window dummies, here other forms of plastic are explored as potential threats to the Doctor and his companion and it is nice to see the concept expanded upon. The Autons become a much more terrifying threat when not only are shop window dummies deadly but you cannot trust phone cords and plastic daffodils either.

There is even a deadly chair that in perhaps one of the show's most gruesome moments swallows Farrell Plastics' head of production George McDermott (Harry Towb) whole. It is not surprising that this serial was criticised by many at the time for being too scary for kids - the special effects may not be the best the classic series has to offer but many of the scenes like many of Doctor Who's greatest stories wouldn't look out of place in a horror movie. Other examples of this include the Dalek sucker coming towards Barbara in The Daleks and Zygon Harry attacking Sarah with a pitchfork in Terror of the Zygons.

Jo Grant is immediately endearing as the Doctor's new companion also. Katy Manning plays the part brilliantly, oozing a certain charm and likeability as the bumbling assistant. Whilst some may question the Brigadier's decision to replace Liz Shaw with her despite her lack of qualifications as the Doctor does in the serial, by the end of the serial you really don't care. Katy Manning sells the character right from the beginning and I have a feeling she will always be considered one of the show's most beloved companions. It is a shame that her debut also happens to be the debut of the Master as she is unfortunately over-shadowed but the production crew at the time weren't to know that the Master would go on to become one of the show's most iconic characters.

It's certainly not hard to see why he has become such an iconic character either. The Master is a brilliant adversary for the Doctor; essentially he is a direct reflection of the Doctor. Whilst the Doctor fights for the good of the universe, the Master fights for chaos and destruction. He is essentially the Moriarty to the Doctor's Sherlock or the Loki to the Doctor's Thor.

Compared to, say, John Simm's Master, here he is treated as more of a behind the scenes presence and for the most part it works better when he is not the front and centre of the plot. The drawback is that it results in a plot resolution that comes out of nowhere. The Doctor manages to persuade the Master round but we are not shown enough of the Doctor and the Master's 'frenemy' relationship to make it convincing that he would be so easily persuaded. I would rather the Doctor had managed to out-wit the Master in his plan rather than talk him round.

Roger Degaldo is brilliant as the Master though and will always be to many the definitive version of the character. He has a certain sinister charm as the Doctor's Time Lord nemesis and doesn't need to act insane in order to have a big presence onscreen. Whilst I like John Simm's later portrayal of the character, I would have rather seen him play the part like Roger Degaldo as opposed to bearing more similarities to The Joker. Michelle Gomez as Missy will likely always be my favourite take on the character but if it were not for the legacy left by Roger Degaldo it is highly doubtful that her version of the Master would exist. Roger Degaldo's performance is the reason why the Master has become such an iconic part of Doctor Who mythology; the part was very clearly written for him as he has a wonderful sense of gravitas in the role. Roger Degaldo quite simply was the Master.

One of the things I think is a shame is that the Master no longer has the hypnotic powers he displays here. I like the idea of the Master hypnotising people; it helps to show how different he is to the Doctor despite being of the same race and it bears similarities to brain-washing techniques seen in real life ruthless dictators such as Adolf Hitler or Vladimir Putin. The notion that somebody could mess your mind and, for example, persuade you to set off a bomb is a scary one and something that is actually quite true to current society with the way terrorists have twisted people into exacting their plans of terror. A brilliant decision by writer Robert Holmes to have Jo Grant placed under the Master's hypnotic powers also as it leaves the viewer feeling uneasy to see one of the Doctor's friends turn against him. I would like the new series to show Missy hypnotise the companion for an entire series as I think the uneasiness that comes from somebody close to the Doctor being placed under the spell would make for an interesting angle to be explored in more depth.

Overall, Terror of the Autons takes the concept of the Autons and offers a deeper exploration of how they can be a threat to our planet. Not only can they possess shop window dummies now but telephone coils, chairs and plastic daffodils can also be brought to life - giving the terrifying impression that nothing made of plastic material is safe from the clutches of the Nestene.

The story serves as a great introduction for Katy Manning's Jo Grant - one of the show's most charming companions - however it is over-shadowed by the debut of Roger Degaldo as the Master. It is easy to see why the Master has developed such a legacy within Doctor Who after watching Roger Degaldo's performance in the role; he is amazing and a true highlight of the Autons' return, even if the character's tendency to act behind the scenes rather than at the forefront of the episode results in a rushed conclusion that comes out of nowhere.

It's a shame that the new series has opted to ignore the Master's hypnotic powers as they are a great way to emphasise the difference between the Doctor and the Master, as well as offering a nice sense of uneasiness to the plot when the Doctor's new companion Jo Grant is placed under his hypnosis. I hope for Series 10 that Missy places the twelfth Doctor's new companion Bill under his (or rather her) hypnotic powers but somehow I doubt it is going to happen (NB: It didn't).