[[quoteright:350:http://static.tvtropes.org/pmwiki/pub/images/eden_6225.jpg]]
[[caption-width-right:350:I may be wrong... but I think it wants a hug...]]

->'''Romana''': ''I don't think we should interfere.''\\
'''The Doctor''': ''Interfere! Of course we should interfere! Always do what you're best at, that's what I say.''

The Doctor and Romana arrive on a space liner orbiting the planet Azure. The liner has just been impaled by a private spacecraft due to an accident leaving hyperspace. To be more precise, the accident happened because the navigator of the liner was stoned out of his mind on a horribly addictive illegal drug called vraxoin, and it appears somebody onboard the liner is smuggling it.

A biologist named Tryst, travelling aboard the liner, is carrying a machine of his invention that keeps samples of alien ecosystems in pocket universes for observation. The effects of the hyperspace {{Telefrag}} cause a group of monstrous predatory beasts called Mandrels, from the misleadingly named ecosystem of Eden, to escape the invention and start slicing people up.

The Doctor and Romana are further endangered when the brutal and stupid local border guards assume that the Doctor is a drug-dealer, because he was carrying some vraxoin he discovered around as evidence. Also, the captain of the liner gets drugged and spends the rest of the story as a desperate vraxoin addict.

Eventually, the Doctor manages to separate the two ships, with help from the [=TARDIS=]'s systems. The drug-smugglers turn out to be Tryst and Dymond, the owner of the smaller ship. It turns out that vraxoin is made from decomposed Mandrel corpses, which was why Tryst was keeping them in his hi-tech zoo. The Doctor decides to return the Mandrels and the other specimens to their original planets.

The director walked out of this one, leaving Graham Williams to finish the story off. Can you tell?
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!!Tropes

* AllThereInTheManual: The weird glowing thing that knocks Romana out is explained in the novelisation as a venomous Eden insect.
* BadCopIncompetentCop: Fisk (Who crouches on TooDumbToLive with his there's the criminal excuse) and Costa. Subverted with Stott.
* BattleDiscretionShot: The Doctor's fight with the Mandrels as he lures them back into the CET projection. The subject of much condemnation then and since by [[StopHavingFunGuys certain fans]].
* CallBack: The CET machine and the Mandrels are very similar to the Miniscope and the Drashigs from "[[{{Recap/DoctorWhoS10E2CarnivalOfMonsters}} Carnival of Monsters]]".
** The Doctor brings this up when he sees it.
* ClearMyName / NotWhatItLooksLike
* DeathWorld: The misleadingly named Eden. (The novelisation makes it clear that this was deliberately sarcastic.)
* [[DrunkDriver Drugged Pilot]]
* DrugsAreBad
* EarthShatteringKaboom: The original source of vraxoin was a fungus, but the social havoc caused by the drug was so horrific that the planet it grew on got glassed.
* ForScience: Tryst's attempted justification for drug-dealing is to get funding to continue his vital research, to the Doctor's utter contempt.
* FriendOrFoe: Stott and the Doctor initially mistaking each other for the villain.
* GoodScarsEvilScars: Stott has the anti-hero variety.
* HellBentForLeather: Fisk and Costa, verging on LeatherMan.
* HerrDoktor: Tryst, although he's closer to the older unworldly DichterAndDenker German stereotype.
* HoistByHisOwnPetard: Said word for word by the Doctor when he asks Stott if he has heard that expression after he captures Tryst and Dymond using Tryst's own machine.
* JudgeJuryAndExecutioner
* MainliningTheMonster: Part of the plot involves the spread of a new addictive drug, and another part of the plot involves a pack of alien monsters roaming around after escaping while being transported by a zoologist. It turns out that the zoologist is the kingpin of the drug operation, and the drug itself is derived from the alien monsters.
* ManEatingPlant: The centre of a BigLippedAlligatorMoment when the Doctor gets pointlessly attacked by one while wandering around the Eden projection, and defeats it by biting it.
** ...A [[IncrediblyLamePun "Man, Eating Plant"?]]
* PinataEnemy: Monsters that turn into a highly sought-after narcotic when you kill them.
* PortalPicture: The CET machine. You can literally just walk into it.
* ReasonableAuthorityFigure: Captain Rigg, until he gets dosed with vraxoin.
* ReportsOfMyDeathWereGreatlyExaggerated: Stott.
* ScottyTime: Romana gets this when the Doctor asks her to modify the CET.
* SinisterShades: Tryst.
* SlippingAMickey
* {{Telefrag}}: Occurs while leaving hyperspace rather than through teleportation, but still an example.
* UndercoverCopReveal
* VerySpecialEpisode: The Doctor confronts drug trafficking.
* WhatTheHellIsThatAccent: Tryst is mostly sort of German, but occasionally slips into a sudden Italian accent.
* TheXOfY
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