Professor Bernard Quatermass is a heroic scientist character featured in four television serials -- ''The Quatermass Experiment'' (BBC, 1953), ''Quatermass II'' (BBC, 1955), ''Quatermass and the Pit'' (BBC, 1958), and ''Quatermass'' (ITV, 1979) -- and a radio serial -- ''The Quatermass Memoirs'' (BBC, 1996) -- all written by Creator/NigelKneale.

* ''The Quatermass Experiment'': The British Rocket Group, led by Professor Bernard Quatermass (Reginald Tate), successfully launches the first manned mission into space. When it returns, it's carrying an alien lifeform with the potential to bring about the end of life on Earth.
* ''Quatermass II'': Professor Quatermass (John Robinson) is asked to investigate a series of strange meteor showers, and discovers that they're part of a subtle alien invasion.
* ''Quatermass and the Pit'': Professor Quatermass (André Morell) is called in when building excavations uncover a mysterious object that turns out to be an alien spacecraft that has lain undisturbed for five million years.
* ''Quatermass'': Professor Quatermass (John Mills) comes out of secluded retirement when his granddaughter disappears. He finds that she has joined a New Age group called the Planet People, who believe that benevolent aliens will come and take them to a better life on another planet. This being science fiction, there really are aliens, and they really are taking Planet People, but Quatermass has grave doubts about their benevolence.
* ''The Quatermass Memoirs'': Really a retrospective documentary about the series, but includes a fictional strand, set before ''Quatermass'', in which the retired Professor (Andrew Keir) is interviewed about his career.

The Quatermass serials were very successful, and broke the ground for original science fiction on television (previous TV SF had either been children's telefantasy or adapted from literature). As one instance of the series' influence, 1970s ''Series/DoctorWho'' owes a huge debt to Kneale and Quatermass, both in the types of stories being told and in the willingness of BBC executives to let the series tell them. (Kneale himself was reportedly unimpressed by this, feeling that ''Doctor Who'' was stealing his ideas.)

The first three serials were successfully remade as films by Film/{{Hammer|Horror}}, two of which were scripted by Kneale himself. The fourth was re-edited directly into a film-length version, titled ''The Quatermass Conclusion'', and given a limited theatrical release.

''The Quatermass Experiment'' was remade for television by the BBC in 2005 as a single feature-length drama, with the spy subplot and some comic material edited out to save time. For added conformity to the original, this version was broadcast live (the first live drama broadcast on the BBC for many years, with the exception of filmed stage plays) with no special effects that would have been unavailable for TV in 1953. Notable amongst the cast is Creator/DavidTennant, who'd been cast in [[Series/DoctorWho Who]] just before the broadcast.

!!The serials provide examples of:

* AdultFear: The plot runs on this in ''Quatermass''-- teens and young adults under an alien influence become violent; scientist Joe Kapp [[spoiler: loses his wife and children in one of the alien attacks.]]
* AlienInvasion: ''Quatermass II''
* AncientAstronauts: ''Quatermass and the Pit'' and ''Quatermass.''
* AnyoneCanDie: The rather casual death of [[spoiler:Fullalove]], who had survived ''The Quatermass Experiment'', in ''Quatermass and the Pit''.
* ArcWords: The nursery rhyme from ''Quatermass''.
-->Huffity, puffity, Ringstone Round,\\
If you lose your hat it will never be found...
* AstralProjection: In the climax of ''The Pit'', a Martian (whether real or just a manifestation of the spaceship) appears in this way.
* BadassGrandpa: In the fourth serial, Quatermass deduces that only old people can withstand the alien influence and gets to work assembling a team of them to save the day.
* BigRedButton: The nuke detonator in ''Quatermass'' has one.
* BodyHorror: ''The Quatermass Experiment'', and to a lesser extent the second two serials.
* BroadcastLive:
** The three 1950s serials, as was usual in those days because the video recorder hadn't been invented yet.[[note]]The first videotape machines were used in the US in 1958, the same year as the third ''Quatermass'' serial, but the BBC didn't acquire some until a few years later.[[/note]] The second and third serials did include some scenes that were filmed in advance, with the film being played back and fed into the live broadcast feed at the appropriate point. [[note]]This resulted in a drop in picture quality on the film recordings of the live episodes, but most of the film sequences for ''Quatermass and the Pit'' survived and were reinserted into the remastered DVD.[[/note]]
** The 2005 remake of ''The Quatermass Experiment'' was also done live, [[LiveEpisode as a gimmick]], although it backfired slightly because the live footage was treated to look like film.
* CircleOfStandingStones: In the fourth serial (also released in re-edited form as a movie, and variously called ''The Quatermass Conclusion'' or just ''Quatermass''), young people are drawn to stone circles and apparently ascended to a higher plane. But all is not as it seems. It is eventually revealed that standing stones and other ancient sites [[spoiler:are warning markers at places where an alien device killed people in the past -- and is doing so again]].
* ColdIron - proves the Martian "devil's" undoing in ''Quatermass and the Pit''.
* CompilationMovie: ''Quatermass'' was edited down into a feature film called ''The Quatermass Conclusion'' for release in other countries, like the US.
* ContentWarnings: ''Quatermass II'' and ''Quatermass and the Pit'' were both preceded by content warnings for those "of a nervous disposition", possibly the first ever British examples.
* CoolGuns: Kickalong prominently uses a Sterling in several scenes in ''Quatermass''.
* CreepyChildrenSinging:
-->Huffety puffety Ringstone Round.\\
If you lose your hat it will never be found,\\
So pull up your britches right up to your chin,\\
And fasten your cloak with a bright new pin,\\
And when you are ready, then we can begin,\\
Huffity, puffity puff!
* DeathOfAChild: In ''Quatermass'', Joe Kapp's wife and children are killed off-screen in an alien bombardment.
* DecoyProtagonist: In ''Quatermass and the Pit'', Roney actually achieves a lot more when it comes to understanding and neutralising the alien menace than Quatermass.
* TheDogBitesBack: Yeah, ''Quatermass II'' aliens, it's a great idea to [[spoiler:liquidise your rebellious minions' representatives ForTheEvulz when the minions have rocket-launchers]].
* DressingAsTheEnemy: To infiltrate the higher security domes in Winnerden Flats, Quatermass nabs a dead plant worker's uniform in ''Quatermass II''.
* DroppedABridgeOnHim: Twice in ''Quatermass'':
** [[spoiler:Annie gets either knocked out or killed in a sudden head-on crash with a Land Rover driven by possessed soldiers, and then gets incinerated by an alien energy bolt]]
** [[spoiler:Joe Kapp gets ready to heroically sacrifice himself as a backup to Quatermass to ensure the nuke is detonated, but is casually shot dead by Kickalong when the Planet People invade the observatory grounds.]]
* DyingRace: The alien AncientAstronauts in ''Quatermass and the Pit''.
* EnemyWithin: Any human who still has the Martian race memory left intact in ''Quatermass and the Pit''.
* GasMaskMooks: The plant workers in ''Quatermass II''.
* TheGenerationGap: In ''Quatermass'' it turns out that the Generation Gap is caused by the malign influence of aliens.
* HeroicSacrifice:
** Dr. Roney in ''Quatermass and the Pit''.
** In ''Quatermass'', [[spoiler:Quatermass himself and possibly his granddaughter (it doesn't seem that she actually knew what that big red button was for, although the novelization claims "she knew because he knew")]].
* HiddenDepths: James Fullalove is a reporter for an evening newspaper who is fluent in Medieval Latin.
* HostileTerraforming via AtmosphereAbuse: Part of the aliens' plan in ''Quatermass II''. An alien vanguard takes over selected humans so they can build a chemical plant to make an atmosphere that will support their kind of life, and kill off all terrestrial life.
* HugeHolographicHead: The Martian spectre in ''Quatermass and the Pit''.
* HumanResources: Quatermass speculates that this is the alien's motivation in ''Quatermass,'' although we never find out for sure.
* IKnowYoureInThereSomewhereFight: Show up at some point in all of the BBC shows: Quatermass with the three astronaut personalities still inside the monster in ''The Quatermass Experiment'', Quatermass and the possessed Dillon in ''Quatermass II'', and reversing the usual roles, Roney talking Quatermass down when he falls under the Martian ship's influence in ''Quatermass and the Pit''.
* InfantImmortality:
** In ''The Quatermass Experiment'' a young girl encounters the infected astronaut and comes away unharmed.
** But definitely averted in ''Quatermass''.
* IntrepidReporter: James Fullalove in ''The Quatermass Experiment'' and ''Quatermass and the Pit'', and Hugh Conrad in ''Quatermass II''.
* IronicNurseryTune: "Ringstone Round" from ''Quatermass.''
* JustifiedTitle: ''Quatermass II'' features the Professor's experimental rocket, known as the Quatermass II. [[WordOfGod Kneale later confessed]] that he only wrote in that connection because he couldn't think of a better title for the second serial than "Quatermass II", and he had to justify it to himself.
* KillItWithFire: The Army's plan to kill the creature in Westminster Abbey at the end of ''The Quatermass Experiment''.
* MadeOfIndestructium: The craft from ''Quatermass and the Pit''.
* MentalPictureProjector: Roney's "optic encephalographic" in ''Quatermass and the Pit''.
* NukeEm: When the chips are down, Quatermass has few qualms about the applied use of nuclear weaponry. Attempts by the superpowers in ''Quatermass'' to employ this trope are less successful.
* ObstructiveBureaucrat:
** Colonel Breen and the Minister in ''Quatermass and the Pit''.
** Subverted however in ''Quatermass II'', where's he's hampered by them, but also helped by Fowler, a senior civil servant who is experienced enough in the way the system works to realise there's something distinctly wrong going on.
* OmnidisciplinaryScientist: Professor Quatermass develops into one of these over the course of the three fifties serials, although in the first he pointedly notes that he's "only an engineer" during one scene. [[JustifiedTrope Justified]], since when you keep running into hostile aliens, you eventually learn to be prepared.
* PathOfInspiration: The Planet People in ''Quatermass'' are a sect influenced by aliens to voluntarily submit themselves for consumption.
* PillarOfLight: In the fourth, self-titled serial the Planet People are a sect who believe they are being transported to a wonderful new planet by beams of light that descend to the Earth. Professor Quatermass discovers that the beams have a much deadlier purpose.
* PuppeteerParasite: The alien invaders in ''Quatermass II''.
* ReasonableAuthorityFigure: Lomax in ''The Quatermass Experiment'', Fowler in ''Quatermass II'', and Annie Morgan in ''Quatermass''. Quatermass himself probably counts as well.
* ScienceHero: Bernard Quatermass.
* SpontaneousHumanCombustion: In ''Quatermass'', the sole survivor of an alien attack suddenly explodes into ash a couple of days later.
* StarfishAliens: The aliens in ''The Quatermass Experiment'' and ''Quatermass [=II=]'' are weird to almost EldritchAbomination levels. Put another way, the ''least'' bizarre aliens Quatermass encounters are three-legged telepathic insects from Mars.
* TalkingTheMonsterToDeath: Happens at the end of ''The Quatermass Experiment''.
* TelevisionSerial
* TheWildHunt: The episode "The Wild Hunt" of ''Quatermass and the Pit'' involves the alien race holding a periodic Wild Hunt to weed out the unfit. Quatermass theorises that this urge has been genetically passed down through the human race, leading to wars and racial conflict.
* WriterOnBoard: The fourth, self-titled serial: "Hippie teenagers are terrifying, lawless punks with no respect for anything and when the chips are down only a scientific team made up entirely of old people ignored by the world are capable of saving it."

!!The Hammer films provide examples of:
* TheAestheticsOfTechnology: The RetroRocket-style design for the alien spacecraft in the tv serial of ''Quatermass and the Pit'' is replaced in the film with a more exotic design that gave it a more weirdly "alien" look.[[note]]Nearly 5 decades since the film's release, many of the design aesthetics of the alien spaceship -- the surfaces, the lines & curves, and even the color -- which all must have looked very unusual and exotic in 1967, now are all bizarrely similar to what is commonly found on the designs of contemporary automobiles today.[[/note]]
* CaptainErsatz: After the oresuccess of ''The Quatermass Xperiment'' Hammer immediately wanted to make a sequel. They couldn't get the rights however, so they made ''X the Unknown'' a movie with an extremely similar plot-structure and atmosphere to the first with a highly Quatermass-like hero named Doctor Adam Royston.
* CompilationMovie: ''The Quatermass Conclusion'' is an odd example, since the original serial was deliberately written and shot so that it could be edited down into a much shorter movie (the section with the old people in the scrapyard was specifically written to be cuttable without affecting the plot too much). An interesting idea, and it ''almost'' worked.
* HeadInTheSandManagement: The Minister of Defence in ''Quatermass and the Pit''.
* InsufferableGenius: Quatermass comes across as one in ''The Quatermass Xperiment'', refusing to listen to criticism from anyone.
* {{Kaiju}}: The large alien creatures that emerge from the domes and destroy the plant in ''Quatermass 2''.
* SinisterSubway: ''Quatermass and the Pit'' replaces the ordinary building site of the TV show with a London Underground station being reconstructed for an extension, making the scenes even creepier.
* StuffBlowingUp: The climax of ''The Quatermass Xperiment'', replacing the IKnowYoureInThereSomewhereFight denouement of the original. Kneale was not impressed.
* XtremeKoolLetterz: The first film was actually titled ''The Quatermass Xperiment'', to draw attention to its X rating[[note]]approximately an R rating in modern US terms[[/note]] (for motives as described in AvoidTheDreadedGRating, except that this film came by its rating honestly).