[[caption-width-right:350:[[Film/HoneyIShrunkTheKids Honey, I Shrunk The TARDIS Crew]]]]
->''"Do you know why I'm a success, Mr Farrow? Because I've never allowed the word "can't" to exist."''
Given a second season[[note]] (though this story and the next were actually filmed as part of the first season)[[/note]], ''Series/DoctorWho'' kicks off with a sci-fi staple — [[IncredibleShrinkingMan the heroes are shrunk to about an inch tall]].
All the usual fun and frolics with perfectly normal household objects becoming perilous deathtraps are there, but they also accidentally stumble upon a plot by ruthless businessman Forester to launch a new insecticide, [=DN6=], despite it being harmful to other life. A civil servant named Farrow investigates, but upon refusing to back down is murdered by Forester (told you he was ruthless). Forester then summons the creator of the insecticide, Smithers, and blackmails him into helping cover up the crime.
Barbara is made ill by the insecticide, but the others manage to foil Forester's plan by tampering with his telephone, causing the local telephone exchange operator to be suspicious and send her policeman husband along to investigate. He isn't murdered, and brings Forester to justice.
The Irwin Allen series ''Series/LandOfTheGiants'' bears a remarkable similarity.
!!This story provides examples of:
* BehindTheBlack: Ian and Susan don't notice the "giant" dead ants which are merely a few feet away from them (relative to their size) until the ants are shown onscreen. Similarly, after they find the first ant egg they marvel at it, then look down and find a whole bunch more.
* CorruptCorporateExecutive: Farrow, though it's never stated what position, if any, he holds. He could just as easily be some sort of venture capitalist.
* DefinitelyJustACold: Barbara tries to write-off her poisoning symptoms as some sort of minor illness.
* EyeScream: The Doctor manages to have an aerosol can of insecticide (labelled "Highly Flammable") explode right next to Forester, who reacts by holding his hands over his face and screaming in agony, heavily implying some metal hit him in the eye.
* FailedASpotCheck: Barbara specifically tells Ian she got some of the sticky stuff on her hands, but later he doesn't know that she got poisoned.
* GreenAesop: Spraying chemicals everywhere, even with good intentions, can have unintended consequences.
** Worth pointing out that this serial was made just two years after the publication of ''Literature/SilentSpring'', which kick-started the modern environmentalist movement and led to (among other things) the banning of DDT.
* HandWave: The reason behind the shrinkage of the Doctor and Co. is... Space Pressure.
** The novelization by Creator/TerrenceDicks is a bit more detailed, explaining that it's connected to the amount of atmosphere suddenly displaced by the TARDIS' materialization, and how materializing incorrectly results in the "Space Pressure" effect.
* HeKnowsTooMuch: Happens to Farrow when he crosses Forester. Nearly happens to Smithers but for a can of insecticide blowing up.
* IncredibleShrinkingMan: Obviously.
* LittleOldLadyInvestigates: Hilda.
* MyGodWhatHaveIDone: Smithers when he realises just how dangerous his pesticide is, especially after his cat dies.
* ObstructiveBureaucrat: Subverted. Forester thinks of Farrow this way, but Farrow is actually in the right.
* PoorCommunicationKills: Barbara gets poisoned and gets progressively more ill as the serial goes on, but hides it. A lot of people seem to think this is a plot hole, but it's really just traditional British culture, stiff upper lip and all that. Everybody's already trying to get back to the TARDIS, so she feels explaining the poisoning would hurt them unnecessarily.
* PyroManiac: The Doctor seems ''very'' enthusiastic about causing a gas explosion.
* SmartBall: Susan, with her observations about the nature of the insecticide. May simply be her failing to hold the IdiotBall for once, given her [[InformedAttribute Informed intelligence]] in the pilot and a few of her later episodes.
* TwoScenesOneDialogue: When they finally realize that no, they're not at the World's Fair.
* WellIntentionedExtremist: Smithers believes initially that his pesticide is the only way to avoid world starvation.
* YankTheDogsChain: the uncontrollable [=TARDIS=] lands by chance back on Earth in Ian and Barbara's home period (early-60's London), but they're an inch tall and have no way of getting back to normal without taking off and getting lost again.