[[quoteright:300:https://static.tvtropes.org/pmwiki/pub/images/1983_xtro_video_cover.jpg]]
[[caption-width-right:300:Daddy's home, and he's not what he used to be...]]

->''"Some Extra-Terrestrials AREN'T friendly!"''
-->-- The film's tagline, making a reference to some [[Film/ETtheExtraTerrestrial other alien movie]]

An infamous British cult classic made in 1982 directed by Harry Bromley-Davenport and produced by New Line Cinema, notable for being one of the strangest British horror movies ever made on account of its bizarre plot involving [[BodyHorror gruesome mutilations]], [[MindScrew nonsensical imagery]] and [[ArsonMurderandJaywalking family drama]]. It stars Philip Sayer, Bernice Stegers, Danny Brainin and Creator/MaryamDabo.

The plot is not that complex - Sam Phillips, a family man, is playing with his son in a field when the sky opens up and he is [[AlienAbduction whisked away by a bright light]]. Three years later, his son Tony is still trying to cope, and Sam's former wife, Rachel, has a new American boyfriend. But then a light appears in the sky and [[WasOnceaMan something]] lands. Sam's back, and he's none too happy about the new family situation...

The film is a bit of divider - its bizarre mash-up of a plot is the very same thing that people either love or loathe about the film. The film's bizarre synthesizer soundtrack, [[DoItYourselfThemeTune done by the director himself]], also contributes to the off-kilter tone of the film.

[[ThematicSeries Spawned two sequels, the only connection between being that they have the same director and involve evil aliens.]]
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!!This film has examples of:

* AlienBlood: Sam's quadruped alien form appears to have orange and thick, almost gelatinous blood, most evident when he is accidentally hit by the couple's car, and the driver examines his wound. [[spoiler:His second alien form has black blood]].
* AllThereInTheManual: Sam was a former scientist. This doesn't get mentioned in the final cut of the movie, however it appears on the home video synopsis.
* AmbiguousSituation: Was it actually Sam that returned, having been transformed into an alien by aliens, or was the returned Sam an alien doppelganger or clone hybrid with his memories, and the original Sam is dead or still in space?
* AndIMustScream: [[spoiler:Analise after she is "impregnated" by Tony. She transforms into a completely immobile egg-factory and is implied to be conscious the full time]].
* ArtisticLicenseBiology: Tony's pet snake is a ribbon snake, known for giving birth to live young. Meaning that scene when Sam eats it's eggs shouldn't have happened.
* AssholeVictim: [[spoiler:Mrs. Goodman is a downplayed example; she's shown to be a nice woman in most scenes. Her biggest crime was horribly killing Tony's pet snake Henry, but it was out of panic. At worst, she's just an annoying cheek pincher, which is why Tony is less than receptive to her.]]
* AttackOfTheKillerWhatever: The Xtro's powers allow them to turn toys into various monstrosities, including a clown, tank, panther and commando.
* BittersweetEnding: [[spoiler:The original ending (for Rachel at least), which has Rachel return to the flat to find a host of Tony clones - it's creepy, but a bit happier as opposed to the final ending]].
* BizarreAlienBiology: Both of Sam's alien forms qualify, but ''especially'' the first one. It is a quadruped creature that resembles a human scuttling backwards, with its... ehh, "reproductive tentacle" emerging from the slit right below the neck. Also, as above mentioned under AlienBlood, its blood is orange and gelatinous. It also can't seem to survive in Earth's atmosphere for long, or had a very short lifespan, as it died and quickly decomposed overnight after impregnating the woman in the cottage. [[spoiler:His final form is a black, alien skeleton with little in way of tissue and skin, pincers for hands, and with its heart located in the stomach]].
* BlueAndOrangeMorality:
** While he doesn't go out of his way to harm anyone, Sam still causes deaths of several people throughout the film. His first victims are a couple who struck him with their car by accident while he was in his alien form. His second victim is a lady living in a cottage, which he impregnated because his alien form, as evident post-impregnation, had a limited lifespan so he needed someone to quickly use as a host until he is ready to emerge as fully grown human. Once he is reunited with his family, he is seemingly happy to finally be with his son again, and apparently tries to rekindle his relationship with Rachel, despite her having a boyfriend. [[spoiler:Once they get to the cottage however]]...
** Arguably, the unseen aliens that originally kidnapped Sam could qualify as well. They separated Sam from his family and caused his son severe trauma that gave him nightmares for ''three years'', took him to their world and genetically altered him in order to be able to live there, and then allowed him to return to Earth so he can bring his son back with him. After all the things Sam does in the movie as soon as he lands on Earth, it's safe to say these aliens, the major culprits behind his new personality, have very warped sets of morals, if ''any''.
* BodyHorror: Where to begin? Sam's first alien form, a quadruped, deformed creature that seemingly moves backwards. The cottage lady which alien-Sam impregnates, and as result she later gives birth to a fully grown Sam, killing her in the process. Analise, once Tony infects her with alien DNA, turns her into a living egg-dispensing cocoon. [[spoiler:Sam as he slowly rots and falls apart after having sex with Rachel, and becomes a skeletal alien with a beating heart visible in his chest and pincers for hands]].
* BornFromADeadWoman: [[spoiler:Sam from the cottage lady. She dies right after her water breaks and before Sam begins to come out of her.]]
* CreepyChild: Tony [[spoiler:after Sam turns him into an Xtro]].
* CreepyCircusMusic: Plays when Tony's clown toy is brought to life. Also plays in segments during various scenes that also involve said clown.
* DisappearsIntoLight: [[spoiler:Not caused by death, but Sam and Tony, changed into aliens, are taken back to the alien world by the same triangular shaped light which kidnapped Sam three years ago, and later brought him back]].
* DoesThisRemindYouOfAnything: [[spoiler:When Sam comes back, Tony finds him eating his pet snake's eggs, leading Sam to chase him down a dark alleyway, where he consoles him before leaning in and sucking on his shoulder, Tony moaning during the process. Later Sam refers to it as "our little secret", they comment that the nanny is "perfect" and Tony knocks Analise out and performs a similar process, sucking on her midriff. Sexual abuse metaphor, much?]]
* DownerEnding: [[spoiler:The revised ending has Rachel getting assaulted by the Xtro eggs in a similar manner to the cottage lady]].
* DysfunctionJunction: The "family" is already tense before Sam comes back to ruin everything
* EldritchStarship: The strange, triangular glowing energy-ship which kidnaps Sam, then brings him back to Earth three years later. It can also apparently change size and shape, as it's seen towering above Sam and Tony during the film's climax, awkwardly lying on the side before shrinking and disappearing in a flash of light. It's even debatable whether it's a ship or just a portal to the alien world, as Tony simply walks into it and disappears.
* EvenEvilHasLovedOnes: Even though he has been changed into an alien that operates on BlueAndOrangeMorality and who has killed several people who meant him no harm, Sam genuinely loves Tony and even as he says, he only returned so he can [[spoiler:take his son to live with him on the alien world]].
* EvilDetectingDog: Both the family dog and the one owned by the cottage lady cower when the aliens draw near.
* ExpressDelivery: Happens to the woman in cottage, after the first alien impregnates her.
* ExtremeOmnivore: The cottage lady's dog is found eating the remains of the alien that impregnated her.
* FaintInShock: The cottage lady faints after getting attacked by the alien, which gives it the advantage to impregnate her.
* FanService: Bond girl Maryam d'Abo plays the nanny and even strips off in quite few scenes...
* FanDisservice: [[spoiler:...only to get infested with alien DNA and turn into a living egg-dispensing cocoon. Talk about becoming a "sex object"]].
* FaceFullOfAlienWingWong: Alas the poor woman in cottage. [[spoiler:And Rachel too, in the revised ending]].
* GlamourFailure: [[spoiler:Sam's human form only starts to gruesomely rot and fall apart whilst in the process of having sex with his estranged wife]].
* GoOutWithASmile: [[spoiler:The cottage lady seemingly dies with a smile as she gives birth to Sam.]] See TheUnSmile below.
* IndignantSlap: The first thing Rachel does to Sam during their reunion. Understandable, considering he seemingly abandoned her and Tony for no reason for three years.
* InNameOnly: ''Xtro II'' has little to do with the first movie aside from it being about aliens. Director Harry Bromley Davenport admits that it was basically a standalone movie that he threw the ''Xtro'' name on, mainly because he had the rights to the series name but not the first movie itself.
* JerkassHasAPoint: Joe is an unsympathetic jerk, yes, but he has every right to not trust Sam after the man (seemingly) walked out on Rachel and Tony for three years.
* LeftHanging: There doesn't seem to be a real reason for Analise to turn into an egg-laying cocoon other than shock value and whatever Sam had in mind was never elaborated on.
* MindScrew: Once Sam returns from his abduction, things get strange to say the least.
* MonsterClown: One of Tony's dolls is a clown that comes to life (and is armed with a razor-bladed yo-yo no less).
* MurderousMannequin: The life-sized Action Man [[spoiler:that kills Mrs. Goodman]].
* OhCrap: Joe has one when he notices that [[spoiler:the woman in the picture Sam had in his jacket pocket looks exactly like the murdered woman in the newspaper]]. Also the driver when he notices that the "animal" he hit with his car has a hideous humanoid face attached to it.
* RealityWarper: [[spoiler:Sam, after turning Tony into an alien, gives him the power to "If you think really hard about something, it will happen." Afterwards, Tony manifests a creepy clown, a jaguar, and causes his toys to attack]]. The trailer for the film even states that the titular alien bears "powers of black magic from deep space."
* RedEyesTakeWarning: Sam's first form has red sclera with no irises or pupils.
* ScreamingBirth: The cottage lady screams as she goes into labor giving birth to Sam.
* SexSignalsDeath: [[spoiler: Neither Joe nor Analise last long after their romp. Rachel also dies shortly after her encounter with Sam in one ending.]]
* SoundtrackDissonance: Perhaps the best choice to accompany gruesome birthing scenes isn't sappy synth music.
* SpoilerCover: [[spoiler:The trope image of the VHS cover shows Sam's final form]].
* SuperScream: [[spoiler:Near the end of the film, the half-changed Sam uses his horrifying alien scream aimed at Joe, whose ears erupt in a bloody gush before he collapses dead]].
* SurrealHorror: The film gets pretty trippy during its second half, though whether it was deliberate or not is another question.
* SweetTooth: Mrs. Goodman seems to have a fondness for sweets. It proves to be her undoing when she reaches out of her hiding spot to grab a piece of chocolate that fell on the floor, drawing the toy soldier's attention.
* TranshumanTreachery: Once Sam becomes an alien, he embraces BlueAndOrangeMorality and feels no qualms about exploiting every Earthling he comes across, even after he turns back into a human. [[spoiler:Once Tony begins the transformation process, he too adopts the same attitude, feeling little remorse about killing his neighbor and turning his babysitter into a seed-producing husk]].
* TheUnSmile: After the cottage lady falls down due to her growing belly's weight, at one point she looks like she's smiling. Although it's possible that the pregnancy process transformed her mind to become "maternal", thus causing her to smile upon feeling her "offspring" moving inside her belly.
* WardrobeMalfunction: After being impregnated, the cottage lady's belly grows so giant that it opens her dress, showing its full size.
* WasOnceAMan: Upon being abducted, Sam has been altered by the aliens to survive on their homeworld. After returning to Earth, he seemingly looks human but as the plot goes on, it becomes increasingly obvious that he is anything ''but'' human.
* WhyDidItHaveToBeSnakes: Mrs. Goodman freaks out and kills Tony's pet snake when it drops from the ceiling onto her salad.
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