%%Please go gentle on this page. It is an important rule of thumb for a work page on TV Tropes to avoid mentioning critical reception and viewer opinions, no matter how much an editor may be tempted to do so on a work. The page quote from Nash Bozard is the only dig allowed, as it was said in jest and links back to his own works relevant to this episode.

[[caption-width-right:344:"Hey! I know my behavior's been erratic lately, but please don't take away my sexy rainbow coat!"]]
->''"I am the Doctor, whether you like it or not."''
-->-- '''The Doctor'''

->''"We Didn't!"''
-->-- '''[[WebVideo/WhatTheFuckIsWrongWithYou Nash Bozard]]'''

The one with... the '''coat'''.

The story where Creator/ColinBaker made his explosive debut as the Sixth Doctor, ratcheting wildly from one emotion to another, showing the range of Colin's acting talent in a very upfront manner.

The Doctor isn't recovering well from [[Recap/DoctorWhoS21E6TheCavesOfAndrozani his regeneration]], suffering mood swings, arrogance, bad temper, and ''terrible'' dress sense. He suddenly decides Peri is evil and tries to kill her, then one mood swing later is full of remorse and declares his intention to find a deserted asteroid and become a hermit. Peri is not much impressed, particularly since he seems to have decided she has to go and be a hermit too.

As luck would have it, however, the deserted asteroid is also a stopping-off point for a group of kidnappers who have just abducted a pair of identical twin geniuses to assist with a sinister plot. It isn't long before the Doctor's rediscovering his enthusiasm for saving the universe from evil telepathic giant slugs.

His dress sense seems to be [[ImpossiblyCoolClothes altered]] [[ImpossiblyTackyClothes permanently]], though.

This episode was pinned onto the end of Season 21 when the idea of introducing viewers to a brand-new Doctor right off the bat instead of making them wait for the next season had merit, so the production team decided to strike while the iron was hot. The end result was very daring- suddenly, the kind and noble Doctor was ''radically'' redefined into the polar opposite, a spiky and unpredictable fellow. The turbulent nature of this brand new portrayal would be a subject of debate for ''Doctor Who's'' future, because instead of waiting to formulate a full game plan for the Sixth Doctor, it seemed like jumping headfirst into the wild, uncharted territory was... [[ShapedLikeItself bewildering]], to say the least.

Regardless of what one thinks of this story ([[RuleOfCautiousEditingJudgement and we cannot stress this enough]]), it certainly left a mark on viewers. In fact, a red-haired chap in glasses would famously make [[BrutalHonesty a contentious and sobering comment]] from a live talk show audience about this story and the following season at large and what he would like to do with the show if he was in charge. That same man [[{{Foreshadowing}} would much later become the show-runner himself]], Creator/ChrisChibnall!

* ArtisticLicenseAstronomy: This story butchers basic astronomic facts so badly -- specifically, when the Doctor implies that planets have to be ordered from largest-to-smallest, and that small planets can't be placed near the sun because they'd instantly get sucked into it due to the "gravitational pressure" being too high -- that many fans find it easier to believe that the Doctor's scientific knowledge is still messed up from his regeneration, and that Azmael's just going along with him to avoid being strangled again.
* BigBad: Mestor.
* BrokenPedestal: Edgeworth/Azmael, due to his willingness to kidnap children and do other nasty things in order to rid his world of the Gastropods.
* ContinuityNod:
** The Doctor says, "Brave heart, Tegan." He is addressing Peri at the time, who is confused by the injunction.
** Seen in the TARDIS wardrobe are the Second Doctor's trousers, suspenders and coat; the Third Doctor's velvet jacket and checked cape; and Tegan's coat and shirt
** [[Recap/DoctorWho20thASTheFiveDoctors The Doctor wants to take Peri to the Eye of Orion, but he has trouble remembering the co-ordinates]].
** The Doctor paraphrases Sarah in "[[Recap/DoctorWhoS14E2TheHandOfFear The Hand of Fear]]" when he says "I don't know if I'm coming or gone or even been"
* ContrivedCoincidence: This deserted asteroid suddenly has an awful lot of people on it, doesn't it?
* CreepyTwins: Romulus and Remus aren't evil, but they are spooky mathematical geniuses.
* {{Deconstruction}}: If this serial aired today, people would interpret it as a high-profile trolling effort. The Doctor regenerates back into Creator/WilliamHartnell, undoing all of his character development thus far, and what's more, the new costume is eye-searingly ugly? By all indications, this was not Creator/JohnNathanTurner's intention; Colin Baker was interested in returning to a darker, less trustworthy Doctor, and Nathan-Turner cast someone who was the polar opposite of Creator/PeterDavison. It's hard to explain the outfit, though... except as a deliberate subversion of the hallowed regeneration makeover.
** Six and Peri Brown are assuredly the most controversial portrayal of the Doctor-Companion relationship yet, with the Doctor threatening to abduct Peri against her will and make her into his au pair.
* DirtyCoward: The Doctor, of all people. He does a SecurityCling to Peri on facing his first {{Cliffhanger}}. He gets better though.
* DoesThisRemindYouOfAnything: More than one viewer has noted that, even beyond the obvious strangling, the Doctor's treatment of Peri in this episode and the way she responds to it is uncomfortably similar to [[DomesticAbuse an abusive relationship]]. Which is often cited as yet another reason why this episode and the Sixth Doctor were and are far from popular.
* DoubleMeaningTitle: Anyone who has watched it will think of Romulus and Remus when hearing the title, but anyone who knows it as "the first Sixth Doctor episode" will think of regeneration and his mood swings. Of course, that sentence doesn't apply to most people - any episode with Peri in it is BestKnownForTheFanservice.
* DullSurprise: Romulus and Remus. The actors were picked purely for the fact that they were identical twins and it shows.
* ElmuhFuddSyndwome: The twins both have this... which wouldn't be such a problem if their names didn't both start with "R".
* EstablishingCharacterMoment:
** The Sixth Doctor strangling Peri makes it clear how unstable this regeneration is starting off. Fortunately, the Doctor gets better.
** Mestor has one when he sentences someone to death by embolism for the first time.
* {{Expy}}: Mestor is basically a low-budget [[Franchise/StarWars Jabba the Hutt]].
* GrandTheftMe: One of Mestor's powers.
* HeroicSacrifice: Azmael deliberately triggers a regeneration at the story's end in order to destroy Mestor's consciousness. But since he doesn't have any actual regenerations left, doing so kills him in the process.
* HypocriticalHumor: The Doctor calls out Peri's fashion when redressing, even though his fashion taste is just as bad.
* IHatePastMe: As usual, the Doctor doesn't think much of his former incarnation.
-->''[The Doctor is checking his new appearance in a mirror]''\\
'''Doctor:''' Ah. A noble brow. Clear gaze. At least it will be, given a few hours sleep. A firm mouth. A face beaming with a vast intelligence. My dear child, what on Earth are you complaining about? It's the most extraordinary improvement.\\
'''Peri:''' On ''what''?!\\
'''Doctor:''' [[Creator/PeterDavison My last incarnation]]... Oh, I was never happy with that one.\\
'''Peri:''' Why ever not?\\
'''Doctor:''' It had a sort of feckless "charm", which simply wasn't ''me''!
* InsufferableGenius: Imagine if there were ''two'' Wesley Crushers, and you've pretty much got Romulus and Remus.
** And if you shove them into one body you'd get the Sixth Doctor!
* ItIsPronouncedTroPAY: A RunningGag in this episode is the different ways in which "Lieutenant" is pronounced, with Peri saying "Loo-ten-ant" (the American pronunciation) and the Doctor and Lang saying "Leff-ten-ant" (the British pronunciation).
* KnightErrant: The Doctor describes himself as one:
-->I'm a knight errant, not an errant fool!
* LaughingMad: The Doctor's regeneration trauma runs the gamut of emotions, from "happy drunk" to "raving paranoia" and everything in between. The wardrobe change is interrupted by a bout of [[WhoWantsToLiveForever existential angst.]]
-->"Nothing but the... urk!... grinding engines of the universe! The... crushing boredom of eternity! [=HAAAAAHahahahAHAhahahaA!=]"
* LeaningOnTheFourthWall: The Doctor's speech to Peri near the end is no doubt meant for the audience, as well as her. The Doctor even makes a few good points, [[DroppedABridgeOnHim shame that didn't save him in the end...]]
--> '''Doctor''': And I suggest Peri that you wait a little before criticizing my new persona. You may well find it isn't quite as disagreeable as you think.
* MoodSwinger: The Doctor's moods are completely out of control in this story, as a result of his regeneration.
* MyGodWhatHaveIDone: The Doctor regains his senses just in time to stop his attempt to kill Peri.
* TheNthDoctor: Creator/ColinBaker makes his debut as the Doctor.
* OurGraphicsWillSuckInTheFuture: Perhaps the best example is the ''symphony in higher mathematics'' which is composed of large pixels.
* PettingZooPeople: The Jacondans look distinctly avian, with a helping of BigOlEyebrows and mustaches.
* PlanetaryParasite: The episode featured the Gastropods, a race of nearly indestructible creatures who devastated entire planets, but whose eggs couldn't hatch unless seared by a supernova first, limiting their spread.
* ResurrectionSickness: The Sixth Doctor becomes dangerously psychotic and suffers from violent mood swings, first convincing himself that his companion is a spy and trying to strangle her, then declaring that he needs to become a hermit for everyone's safety when he realizes what he almost did.
* ShoutOut: The Doctor quotes from the epic poem "Excelsior." Also, Mestor is a gastropod version of [[Franchise/StarWars Jabba the Hutt]].
* SingleMindedTwins: Romulus and Remus
* SpaceClothes
* TeleportersAndTransporters
* ThemeTwinNaming: Romulus and Remus.
* TenMinuteRetirement: The Doctor's short-lived career as a hermit.
* TooDumbToLive: Had Mestor just taken over the Doctor at the end of the story like he claimed he could, he would have ''won''. Instead, he screws around and decides to possess Azmael, a more experienced Time Lord who isn't in the throes of post-regenerative trauma, which leads directly to his defeat.
* WeUsedToBeFriends: Peri's dismay at what the Doctor has become sums it up:
-->'''Peri:''' ''You were almost young! I really liked you! And you were sweet, and--''
-->'''Doctor:''' ''Sweet? Effete! Sweet? Sweet? Sweet? Huh, that says it all!''
** The Doctor has a similar moment with Azmael later on.
* WhatTheHellHero: Peri does not take the Doctor's attempt at strangling her well, not to mention all his mood swings and unpredictable behavior.
* WholePlotReference: This is a DarkerAndEdgier version of the Fifth Doctor's regeneration story, [[Recap/DoctorWhoS19E1Castrovalva "Castrovalva"]] -- both are regeneration stories about the Doctor trying to pull himself together after a FreakOut while godlike child geniuses warp the fabric of reality.