Doctor Who/Recap/S21 E5 Planet of Fire

"The Master: I am the Master!

Peri: So what? I'm Perpugilliam Brown, and I can shout just as loud as you can!"

Our story begins by focusing on a random group of desert dwellers on the planet of Sarn. There isn't a whole lot to know about these guys, outside the fact that they worship a god named Logar and they have a Chosen One, named Malkon, who is declared so because of a special double-triangle symbol burned into his flesh. A lot of the opening of this episode, and indeed a lot of the serial, generally contains two groups of these people bickering on if their god really exists or not... and it generally goes nowhere, seeing how it's a 'C' plot in a Doctor Who story that's already got a rather busy 'A' and 'B' plot running.

Off in the TARDIS, the Doctor hasn't taken Tegan's decision to leave all that well. He curses the Daleks for a bit before Turlough tells him to snap out of it. However, before either of them can get any more lines in, a random scream pierces the TARDIS control room. Why, that must be Kamelion, and he's in danger! You remember Kamelion, right? He showed up at the tail end of the last season and vowed he'd be a loyal companion of the Doctor! And then he never bothered to show up again until this episode! Boy, what a useless character great friend that guy is.

Well, it turns out that Kamelion has somehow tired of the wild and awesome adventures he's been having with the Doctor sitting around doing jack shit and decided to off himself. Or he's accidentally plugged himself into the wrong part of the TARDIS. Or something. All it looks like is that the Kamelion prop is laying on the ground sparking as a cable stretches into a wall of the TARDIS set. But the Doctor isn't especially worried, as he just leaves the guy laying there on the ground to, apparently, die.

Over on Earth, the same double-triangle is mysteriously found engraved on what looks like an ancient golden dumbbell on an island nation off the coast of Africa by an American archaeologist and his stepdaughter - college student Perpugilliam "Peri" Brown. Peri demands that they go off to Morocco instead, but her stepfather refuses. Peri, being of completely sound mind and judgment of course, decides to take the rather huge artifact with her as she leaps off the boat(!) they've been traveling on and tries to swim to shore. Of course, she nearly drowns. Welcome to the 'D' cups plot!

Luckily, the TARDIS is right nearby. Apparently, the magical alien dumbbell is sending out a Distress Call of some sort. Turlough just happens to see the drowning Peri and decides to save her, only to go through Peri's belongings once he gets her into the TARDIS. Smooth. Either way, Turlough finds the golden dumbbell of the ancients and is shocked by the double-triangle, as he has the exact same symbol burned onto his arm. The Doctor, for his part of this episode, was off having tea while waiting for another bit of the signal. Once he comes back, the Doctor sets off for the source of the signal - taking everyone to the planet Sarn. The Doctor and Turlough immediately go out to look around.

Peri is immediately jumped by Kamelion, who has now taken the shape of... Peri's... step... father. Honestly, most viewers weren't sure what the devil was going on there, but everything was explained nothing makes sense once the face fades away to reveal... the Master! Of course! But it's not really the Master either, it's... Kamelion being controlled by the Master. Oh, no. The robot made to be a slave to the Master is now again a slave to the Master. No one seems very surprised by this.

So, anyway, the Doctor and Turlough find the Sarn people and the Doctor quickly informs them that they just so happen to live in an active volcano system. Not only that, but they happen to be living inside lava tubes and vent chambers. Before much more happens, though, Turlough asks about that double-triangle symbol through showing it off on his arm. They praise him as a second Chosen One, and Turlough realizes that Malkon may well be his brother. And then Peri shows up, having run out of the TARDIS to flee from the incredibly-creepy Kamelion to let Turlough know that someone called 'the Master' has just shown up.

Then Kamelion!Master shows up and promptly takes over the role of "the Outsider" in the local religion, which basically means he gets to run around and tell people what to do. As silly as this seems on paper, in action it just means that Anthony Ainley gets to be awesomely hammy - throwing his arms around like a preacher on Christmas morning. And that's something few fans can complain about, especially when Ainley does it all in a really nice three-piece suit as well. It's soon revealed that what the Doctor assumes is the Master is really Kamelion, so the Doctor starts... acting like a complete and utter asshole to Kamelion, claiming he's trying to free the distressed droid. Then the Doctor is thrown in jail.

Things generally hit the fan, as it turns out that Sarn is an old colonization attempt by Turlough's people, and it just so happened to be a prison world. Turlough is also a criminal-by-relation, his father having led a failed coup d'etat. Seriously. Meanwhile, Peri is taken to the Master's TARDIS by Kamelion and she's forced into labor. Looking inside the Master's "control box," she quickly sees why the Master needed Kamelion... he's now doll-sized. So he runs around his TARDIS while Peri tries to crush him like one would an errant cockroach for the next 10 minutes.

Ok, so the Master finally reveals his supreme plan. Apparently, he accidentally shot himself with an advanced Tissue Compression Eliminator and needs some special regenerating gasses from the planet Sarn in order to return to normal. However, the gasses are stored in the core of the planet, and the Master's dinking around has caused the place to become geologically unstable. Turlough swallows what little pride he has left and calls his people with the wreckage of a crashed spaceship, where his brother also happened to come from. They agree to send a ship to recover those who remain on the planet. Meanwhile, Peri and the Doctor try to stop the Master's super awesome plan... but not before the Doctor decides to use the regenerating gasses to heal up a few of the sick and wounded by setting them on fire.

However, Peri and the Doctor aren't really able to stop the Master. Instead, the Doctor is just barely able to short-circuit Kamelion, giving the robot what the Doctor calls "an electronic heart attack." Kamelion then, in what amounts to Hulk-speak, begs for the Doctor to kill him off. Using the Master's Tissue Compression Eliminator, the Doctor ends Kamelion's life, reducing him to a silver action figure. Meanwhile, the Mini-Master is finally absorbing the regenerative gasses of the planet, and grows back to size...

...until the blue flames that represent the gasses turn to real flames and burn the Master to death as the Doctor stares on in Dull Surprise.

With the Master supposedly dead (again), the Doctor and Turlough part ways while Peri begs to follow the Doctor along on more adventures. The Doctor agrees, hesitantly, and welcomes her to the TARDIS.

Tropes

 * Abusive Parents: While sleeping in the TARDIS, Peri has a nightmare about her stepfather, begging him "I-I'm sorry Howard. I didn't mean it. No Howard, p-please don't leave me alone! Do-don't turn out the lights! HOWWAAAARD!".
 * It goes further in the Expanded Universe. Peri's step father molested her as a child.
 * Beach Episode: (at least at the start) providing an excuse for high levels of Fan Service from Nicola Bryant and Mark Strickson. Actor David Tennant and producer Phil Collinson reminisce fondly about this episode in the hidden commentary on "The Five Doctors". Even Peter Davison's usual cover-all outfits are somewhat relaxed.
 * Big Little Man: Done as a Cliff Hanger reveal when it turns out the Master has accidentally shrunk himself to a small size, and has been directing the shapeshifter robot that everyone thinks is him from a control box.
 * Birthmark of Destiny: Malkon's brand is interpreted as one of these by the people of Sarn.
 * Chekhov's Volcano
 * Dark and Troubled Past: the Turlough brothers
 * Deadly Gas: Inverted - the numismeton gas is healthsome and good.
 * Distress Call
 * Dropped a Bridge on Him
 * Dull Surprise: The Doctor's slack-jawed blank expression as the Master supposedly burns alive.
 * Fake American: Nicola Bryant's "American" accent is... unfortunate, to say the least.
 * Fan Service: This episode is pretty much the apotheosis of John Nathan-Turner's "something for the dads" policy. Although the costumes of some of the male characters are more revealing than usual, making it more equal opportunity.
 * Ham-to-Ham Combat: This adventure features a particularly hammy Peter Davison taking on an even hammier Anthony Ainley. And it is glorious.
 * Peter Davison notes on the DVD's "making of" documentary that Ainley originally tried to underplay the role much more than he does in the finished product. However, the serial's director, Fiona Cumming was known to favour very hammy, over-the-top performances from her actors, and made Ainley turn his performance Up to Eleven.
 * Home, Sweet Home: Turlough's motive for leaving is that he has a chance to go home, and as a hero no less.
 * Hot Scientist: Peri's stepfather.
 * Becomes significantly less hot when you find out what kind of person he was
 * I Just Shot Myself In The Face: strongly implied that this is at the root of the Master's problems
 * Long Lost Sibling: Malkon
 * Male Gaze: This is the very first shot of Peri, setting the stage for pretty much her entire tenure on the show.
 * Mark of Shame: The Turlough brothers.
 * The Master
 * Mercy Kill
 * Moral Dissonance: Burning the Master alive. For a guy who's supposed to be fixated on saving people, he pretty much kicks back, lets the Master burn, shrugs, and walks away.
 * No One Could Survive That:...well, unless they had Joker Immunity, anyway.
 * Ooh, Me Accent's Slipping: Nicola Bryant, again.
 * Perverse Puppet: Good ol' Kamelion. Good riddance to bad props.
 * Purely Aesthetic Glasses: They're baaaack!
 * Robot Buddy: Ditto.
 * Scenery Porn: Starts out like this, but after the first episode the story actually starts doing a good job of using the Lanzarote location, making the titular planet look far more convincing than it would have been if it were just filmed in a quarry.
 * Thicker Than Water: Turlough is ready to kill when Malkon is hurt. The Doctor says it would do no good, whereupon Turlough reveals that they are brothers.
 * What the Hell, Hero?: Yeah, the Doctor's kind of an ass to Kamelion, isn't he? Peri seems to call him out on that during the story, but the Doctor hand-waves it by claiming he's trying to free the poor distressed robot. By being a dick to it. Riiiight.
 * The X of Y