[[caption-width-right:350:{muffled Music/{{Styx}} playing in the distance}]]
->'''Captain Striker:''' You are not an Ephemeral. You are a... a time dweller. You travel in time.
->'''The Doctor:''' You're reading my thoughts.
->'''Captain Striker:''' You are a Time Lord. A lord of time. Are there lords in such a small domain?

The one where '''GOD HIMSELF''' comes back.

After receiving a garbled message from the White Guardian (and almost blowing up the TARDIS in the process), the Fifth Doctor, Tegan and Turlough are taken by the TARDIS to what appears to be an Edwardian sailing ship. The Doctor and Turlough find out that the sailors have absolutely no idea how they came aboard the ship nor who their captain is. (But they got paid in advance, so don't give a damn.)

Meanwhile, Tegan is left in the TARDIS in case the White Guardian sends another message. He does: they have to win "the race" and it's "winner takes all". But before she can get to the Doctor with this urgent information, she runs into the ship's handsome but creepy first mate, Marriner, who tells Tegan in an equally creepy voice that he will take her to her friends. The four of them eventually meet in the bridge, where the Doctor looks at the ship's map just in time for the show's first cliffhanger: [[SpaceSailing the ship is actually a]] ''[[SpaceSailing space]]''[[SpaceSailing ship]], and it's racing with other period Earth ships through the solar system. [[RuleOfCool Because it'd be cool, that's why.]] The prize: Enlightenment!

The officers of these ships are Eternals, mind-reading beings who exist above and beyond our universe. They've lived so long that they have no original thoughts of their own, and must read the minds of mortals ("Ephemerals") in order to alleviate their soul-crushing boredom. Having Enlightenment will ensure that they will never be bored again. The Doctor uses a viewscreen to look at another captain and notices he's wearing an out-of-period '''red jewel''' that '''[[MacGuffin is very important to the plot]]''' so '''pay attention.''' The ships round Venus, and Striker's ship edges so close to the planet in an attempt to get ahead that the ship's almost destroyed. Another ship comes so close that it actually ''is'' destroyed. The Doctor, as always, thinks something more sinister is at hand.

Tegan, Turlough and the Doctor go up to the deck and Turlough suddenly goes apeshit. The Black Guardian is not happy that Turlough [[Recap/DoctorWhoS20E3MawdrynUndead failed to murder the Doctor]], and his disembodied voice tells him he will remain on the ship forever, in "perpetual torment". Turlough shouts "NO! I WILL NEVER SERVE YOU AGAIN!" and jumps overboard.

A badly-yellowscreened net saves him and he's taken aboard another ship, led by the ruthless and hammy Captain Wrack. He manages to convince her that he's on her side and wants to share the prize, and due to his "devious" and "confused" mind Wrack has difficulty reading it. Wrack sends her first mate (played by hammy pop star Leee John) to present Captain Davey (another competitor) with a '''jewelled''' sword and to deliver party invitations to the other captains. Striker refuses the invitation, but the Doctor accepts, wanting to retrieve Turlough.

Meanwhile, Davey's ship explodes. What a coincidence! Tegan is horrified by Marriner's aloof reaction to all the "Ephemerals" who just died on that ship. She's able to shield her mind from him, anyway, simply by being extra grumpy, but it only serves to intrigue him more and he develops a creepy stalky crush on her in the process. Meanwhile, the Doctor puts two and two together and realizes that any ship that challenges Wrack's goes all explodey. On Wrack's ship, she reveals to Turlough how she does it: she goes to a vacuum-sealed chamber where she uses the Black Guardian's power to make the red jewel explode. Somehow.

The Doctor, Tegan and Marriner travel to Wrack's ship, where they mingle at a party while Turlough sneaks off to examine the chamber of explodium. He finds an eye-shaped grid (that looks amazingly like [[http://media.sae.edu/media_thumbs/Images/News/8943_cbs_logo.png the CBS network's logo]]) open to space, but a pirate locks the door and turns off the vacuum shield. Fortunately, the Doctor finds Turlough before he suffocates, but both are immediately captured. Wrack lures Tegan away from everyone else and momentarily stops time so that she can sneak a '''red jewel''' onto the tiara Tegan is wearing for the party.

Turlough turns on the Doctor ''again'' and Tegan, the Doctor and Marriner are sent back to the ship. The Doctor doesn't mind, for he believes that Turlough is trying to stop Wrack. He's right, and Wrack realizes it: she sentences Turlough to WalkThePlank. She pauses, however, when Turlough tells her that he, too, serves the Black Guardian and decides to let him watch her destroy Striker's ship. Luckily, the Doctor realizes just in time that Tegan's tiara contains the jewel. He thwacks it to pieces with an axe, and when that only makes it stronger, he throws it overboard before Wrack can destroy it. He travels in the TARDIS to the other ship to keep her from winning but is thrown overboard along with Turlough. Wrack wins!

Or does she? Well, it turns out that ''she'' and her first mate were the ones who were thrown overboard, not the Doctor and Turlough. They, along with Tegan, Striker and Marriner go to the Enlighteners to claim their prize.

They turn out to be [[OverlyNarrowSuperlative everyone's favourite omnipotent, extradimensional beings who wear birds on their heads]]: the Black and White Guardians! The Doctor declines the prize, saying that no one should receive complete enlightenment, including him.

Striker leaves, along with Marriner, after the latter gets rejected by Tegan... ''again''. But the White Guardian turns to Turlough, and says that since he helped the Doctor win, he's entitled to a portion of Enlightenment. As he reaches out to grab Enlightenment (represented here by a huge white crystal) the Black Guardian says that since the Doctor's indebted to him, Turlough can either have Enlightenment or give up the Doctor.

[[FriendOrIdolDecision You can see where this is going.]]

Yes, he refuses Enlightenment and throws the crystal at the Black Guardian, who promptly catches fire because "light defeats darkness". The White Guardian congratulates Turlough, and the Doctor says that Enlightenment was not the diamond, but the ''choice''. Cue credits.


This story marked the final televised appearance of the Black and White Guardians and their [[NiceHat ducky hats]], though a character intriguingly similar to the Black Guardian -- though minus the hat, and identified as "the Trickster" -- turns up in ''Series/TheSarahJaneAdventures''. The Guardians, of course, return in the Franchise/DoctorWhoExpandedUniverse, including AudioPlay/BigFinishDoctorWho.

* AllThereInTheScript: Although the dialogue in which he gives the information is inaudible, the script (or lip-reading his initial message) makes it clear that the White Guardian's mission is for the Doctor to stop Wrack winning the race, which would have devastating consequences for the whole universe.
* BlueAndOrangeMorality: The Eternals, especially Striker and Marriner, simply do not understand human/Time Lord morality. Wrack is a bit more of a clearcut villain, but still has shades of this
* {{Brainwashed}}: Brainwashing rum is given to the sailors to prevent them from questioning why they're on the ship and why it's in space.
** And when it turns out one of them is a teetotaler... they make him [[DrinkingTheKoolaid happy to continue working for them]] in (thankfully unspecified) other ways.
* CompleteImmortality: The Eternals dwelt in the domain of Eternity rather than the smaller one of Time. This meant they were unaffected by Time and thus unaging. Another factor is that Eternals cannot be destroyed, only transferred back to Eternity. However, in the ''Magazine/DoctorWhoMagazine'' comic ''Uninvited Guest'', the Seventh Doctor might have found a loophole.
* CoolShip: The whole race idea is built on this trope. Admittedly, it ''is'' pretty awesome.
* DeceptiveDisciple: Turlough
* DissonantSerenity: Marriner, of the [[CreepyMonotone creepiest kind]]
* DistressedDude: Turlough. This seems to snap him right out of suicidal mode. And the Doctor himself.
* DoggedNiceGuy: Marriner
* DrivenToSuicide: Turlough (attempted)
* TheEdwardianEra
* EldritchAbomination: The Eternals exist outside of time and space in eternity, have great RealityWarper powers and they are to ''Time Lords'' what Time Lords are to other races.
* FriendOrIdolDecision
* FunnyBackgroundEvent: The Doctor quietly replaces his wilted lapel celery with a fresher one from Wrack's party.
* GorgeousPeriodDress
* ImpossiblyLowNeckline: Tegan's [[TheEdwardianEra Edwardian]] ballgown
* LargeHam: The Black Guardian, Wrack, Turlough
* MindControlEyes: The Doctor notices that the sailors "look hypnotised".
* MoreThanMindControl as MindRape: The Eternals do this a lot, not always successfully.
* NewspaperDating: While they're exploring the ship at the beginning of the story and trying to figure out where they are, the Doctor finds a newspaper with a 1902 cover date and the headline "First British Submarine Launched". Played with, since it turns out the Eternals have taken their crews from all through history, so the newspaper shows when Striker's crew were taken but doesn't help with the question of where and when they are now.
* NoSell: Tegan manages to shut an immortal, eternal being out of her mind, just because he was annoying her ''too'' much.
* NothingIsScarier: At the beginning of the episode, the TARDIS crew has no idea where they are, and the scanner gives them no help whatsoever. Made even scarier for Tegan, since she stays there longer and is therefore in the dark for a longer time.
* OneWordTitle
* OrderVersusChaos: The Guardians. With matching birds on their heads (white and black, respectively, for extra subtlety).
* ParentService: Tegan wears a beautiful, [[http://static.tvtropes.org/pmwiki/pub/images/tegan_dress_2634.jpg low-cut]] dress that actually caused a couple of [[WardrobeMalfunction Wardrobe Malfunctions]].
* PirateGirl: Captain Wrack
* PluckyGirl: Tegan
* ReCut: The DVD version includes a "movie" edit with new CGI special effects and some scenes altered or re-ordered.
* SecretTestOfCharacter
* SpaceIsAnOcean
* SpacePirates: Lynda Barron (Captain Wrack) plays one of the best space pirate captains anywhere. Her performance is larger than life, but works well within the confines of the story
* SpaceSailing: The Doctor and his companions find themselves on board a SufficientlyAdvancedAlien Edwardian ship in space, powered via solar sails, which is participating in a race around the planets, along with other such ships from different periods from human history, including a Greek trireme... with ''rowers''.
* SwitchingPOV: Switches with the Doctor, Tegan and Turlough
** The consistent tension between Tegan and Marriner is told from both points of view: he views her as fascinating, but she sees his fascination with her as physically (and sexually) threatening, and makes her discomfort VERY clear to him (because she is Tegan, and she does not stand for that sort of behaviour). He is often shot as though he physically looms over her, driving the point home. Marriner is deeply puzzled by Teganís fear, which emphasizes his alien nature (and his Eternal privilege).
* {{Telepathy}}: The Eternals can use telepathy and create objects from the memories of Ephemerals, but their powers were not limitless and they could not read minds from great distance or from strong minds (though Adrenaline from the mind they're accessing helps greatly).
* UnwittingPawn: Averted when Turlough turns on the Black Guardian - but also implicitly played straight with the Doctor as the gambiter and the Black Guardian as the sucker.
* WalkThePlank
* WardrobeMalfunction: That beautiful, [[http://static.tvtropes.org/pmwiki/pub/images/tegan_dress_2634.jpg low-cut]] Edwardian dress Tegan wears for the party? Incompatible with the ''Series/DoctorWho'' tradition of running up and down corridors--Janet Fielding popped out of it a couple of times during filming.
* WhoWantsToLiveForever: Eternity is boring, so the Eternals have to find ''something'' to do to occupy their time.
* YouHaveFailedMe: played straight ([[LargeHam with ham]]) by the Black Guardian