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the Doctor Who serial

The Twin Dilemma is the seventh and final serial of the 21st season of the British science fiction television series Doctor Who, which was first broadcast in four twice weekly parts from 22 March to 30 March 1984. In the serial, the alien Gastropod Mestor (Edwin Richfield) plots to explode the sun of the planet Jaconda to scatter his eggs throughout the universe to conquer it. It was the first to star Colin Baker as the Sixth Doctor uniquely being the final story of the season.

As a result of his recent regeneration, the Sixth Doctor suffers from mood swings and violent delusions, culminating in his attempt to strangle his companion, Peri Brown. Realising the threat he could pose to the universe in this state, the Doctor decides to exile himself (and Peri, over her protests), to a remote asteroid named Titan 3. Meanwhile, the mysterious Professor Edgeworth abducts two teenaged math geniuses, Romulus and Remus Sylvest, at the behest of Mestor, the leader of the slug like Gastropods who have usurped Edgeworth as ruler of the planet Jaconda. Mestor orders Edgeworth to hide on Titan 3, and destroys a pursuing squad of fighters. The only survivor of the fighter squadron is Lt. Hugo Lang, who crash lands near the TARDIS. The Doctor saves Hugo at Peri's behest, and he and Peri investigate the asteroid, leading to them being captured by Edgeworth. The Doctor recognises that "Edgeworth" is actually Azmael, a fellow Time Lord and his former tutor. Azmael tries to strand the Doctor and Peri on Titan 3, but unbeknownst to Azmael, his assistant Noma arms a bomb intended to kill them both, and they narrowly escape with their lives. The Doctor, Peri, and Hugo follow Azmael to the now desolate Jaconda, where Azmael makes it clear he never intended for them to be harmed, and reveals that Mestor is forcing him to have Romulus and Remus create calculations which will terraform two nearby planets that the Gastropods can settle on. The Doctor, however, realizes that Mestor has lied to Azmael about the nature of his plan, and the calculations will actually cause Jaconda's sun to go supernova, allowing Gastropod eggs to infest the galaxy. After the Doctor tries and fails to kill him, Mestor announces that he will take over the Doctor's body. The Doctor tries to goad Mestor into doing this, but he instead takes over Azmael. The more experienced Azmael manages to briefly retake control of his body and initiates a regeneration, but since he has used up his entire regeneration cycle, this has the effect of killing both himself and Mestor, though Azmael and the Doctor make amends before the former dies. Hugo decides to stay on Jaconda and become its new ruler, while the Doctor agrees to return Romulus and Remus to their parents. Peri still has doubts about the Doctor's new personality, but he reminds her that "I am the Doctor, whether you like it or not!"

The Doctor is unusually violent at the start of this episode, even attempting to strangle Peri. The intention was to create a Doctor that was initially unlikeable, but would gradually reveal a kind hearted soul (glimpsed in Revelation of the Daleks). This was also intended to be a contrast to the instantly likeable Tom Baker and Peter Davison Doctors. However, in later interviews, director Peter Moffatt said that the original idea was merely to have the Doctor in a much more energetic state than he was during the Fifth Doctor's début story Castrovalva. Colin Baker said during a 2003 documentary celebrating the series' 40th anniversary that "the idea was that over the many, many years I would be playing the part, the outer layers would gradually peel away, revealing the kind hearted soul." At least one aspect of Steven's original script featured the Jaconda and Gastropods being dropped totally early in the fourth episode without resolution to the plot, with the final battle taking place in another dimension against a being called Azlan who was controlling Mestor all along. The cat badge worn by the Sixth Doctor on his lapel for this story was handmade and painted by Suzie Trevor and purchased for the programme from a specialist badge shop in central London. For each subsequent story, the Doctor was to wear a different cat badge to symbolise that he was a "travelling cat of different walks." Besides being adjusted for the new Doctor, the opening credits underwent additional modifications with this episode. A prism colour effect is added and the series logo takes on a somewhat bluish hue (which also results in it appearing slightly curved in comparison to the version introduced during Tom Baker's era). The theme music remains the same version as that introduced in 1980. Prior to this, the opening sequences of the Second, Third, Fourth, and Fifth Doctor eras had incorporated a still photograph of the lead actor. For the Sixth Doctor opening this was changed to using two photographs – one of the Doctor with a smile which changes to a second image showing the Doctor grinning. This limited animation would continue with the opening sequence for the Seventh Doctor.

Colin Baker also provides, uncredited, the voice of a Jacondan at Freighter Control in part three. Dennis Chinnery had previously appeared as Albert C. Richardson in the William Hartnell story The Chase and as Gharman in the Tom Baker story Genesis of the Daleks. Edwin Richfield had previously appeared as Captain Hart alongside Jon Pertwee's Doctor in The Sea Devils. Kevin McNally later played Henry in the audio play Spider's Shadow, and Professor Eustacius Jericho in the Jodie Whittaker episodes "Village of the Angels", "Survivors of the Flux" and "The Vanquishers". Seymour Green had previously played Hargreaves in The Seeds of Doom. Helen Blatch had earlier been a voice artist in The Deadly Assassin.

A novelisation of this serial, written by Saward, was published in hardback by Target Books in October 1985, and in paperback in March 1986. The cover illustration originally featured Colin Baker; however, when Baker's agent enquired about a royalty, the decision was taken to not feature him on the cover and a replacement was commissioned. This adaptation is notable for Saward's convoluted attempt at explaining in detail how the regeneration process works. In January 2012, an audiobook of the novelisation was released, read by Colin Baker.

The Twin Dilemma was released on VHS in May 1992. The tape was available exclusively through branches of Woolworths as part of a special promotion. A general release followed in February 1993. It was released on DVD on 7 September 2009 in the United Kingdom and on 5 January 2010 in the United States. This serial was released as part of the Doctor Who DVD Files in Issue 127 on 13 November 2013.