Aliens (1986) is the second film in the Alien film series. It was directed by James Cameron, and shifted the theme from horror to action.Ripley wakes up from hypersleep nearly sixty years later. Her former employers, the Weyland-Yutani company, refuse to believe her claims about the alien and revoke her licenses. Not long after, the colony established on the world from the first movie while Ripley was in hypersleep goes silent. The company sends a unit of Space Marines to investigate, along with Ripley, who reluctantly agrees to act as an advisor. At the colony they discover a whole nest of aliens.
This film provides examples of:
Acoustic License: Bishop, we know it's windy, but do you really have to scream into your headset that the transport is coming? Good thing Ripley's eardrums are apparently even tougher than the rest of her.
Ellen Ripley graduates to one. Although not possessing any particular combat skills, she has the guts and determination to survive.
Vasquez, one of the Marines who nearly makes it to the end. Also known for being more rough-and-tumble than the other Marines.
Hudson: Hey, Vasquez, have you ever been mistaken for a man? Vasquez: No. (beat) Have you?
Action Mom: Ripley essentially adopts Newt, and goes to enormous lengths to protect her. This is set up earlier in a deleted scene (included in the novelisation and the Special Edition) which reveals that her daughter had died of cancer in her old age while Ripley was lost in hypersleep, and Newt is the same age that her daughter would have been.
Admiring the Abomination: Bishop displays this sort of behavior when studying a Facehugger carcass, implying that he'll turn bad by drawing parallels to how Ash, the other synthetic person that once came into contact with the Aliens, reacted to the creature. It's a Red Herring; Bishop remains a good guy.
And I Must Scream: The nightmarish ordeal endured by the 157 Colonists Burke murdered. See Nightmare Fuel in the YMMV entry for more details, if you dare...
Air Vent Passage Way: Ripley and the marines use ducts to escape the monsters (which likewise use the ducts to invade). Likewise the aliens bypass the walls and doors by sneaking through the ceiling plenum Ó laThe Breakfast Club, correctly using the structure to carry their weight and cross the lay-in-ceiling.
Armor Is Useless: Averted. A splash of Alien blood does burn through Hicks' armor quickly (badly injuring him), but it's obvious the armor is the only reason he lived.
Artistic License - Gun Safety: The Marines use guns in a combat setting fairly professionally, but one example of horrendous gun safety stands out: when Vasquez and Ripley are helping Bishop into a conduit, Vasquez cocks a pistol and hands it to Bishop, who immediately puts his finger on the trigger. He then hands it to Ripley, finger still on the trigger and pointed straight at her. Ripley accepts it and sets it aside, thumb grazing the trigger while it's pointing at Vasquez. Bishop may be an android and thus incapable of unintentional twitches, but casually handing a loaded firearm to an untrained civilian is something a military android should be programmed to avoid.
Badass Boast: Hudson attempts one that even uses the word "badass" as often as he can. He does not deal well with the loss of the high-tech gear that he describes in said boast. He does go down shooting while spitting out even more 'heat of battle' boasts, as well. An Alien has to ambush him from below to take him down.
Badass Crew: The Colonial Marines certainly fit the bill. Too bad they don't last long, since the Aliens are way more dangerous and numerous.
Ripley and Hicks promise each other that they will "take care of each other" if they were hopelessly cornered by the Aliens. It doesn't come to that, and they live through the entire film.
When they're trapped by xenomorphs, Vasquez and Gorman take out several aliens via grenade in the Hadley's Hope air ducts rather than be captured and impregnated.
Beware My Stinger Tail: In the novelization the aliens have these, which are used to paralyze victims to be taken back to the hive for facehugger bait. Gorman gets stung during the escape in the APC after the hive raid goes pear-shaped. The scene was too expensive to film, so he gets knocked out by a container falling on his head instead.
Big Damn Heroes: The moment when Ripley drives the Armored Personnel Carrier through the wall of the xenomorph hive to save the remaining Marines trying to escape is the biggest example of this in the main series.
Big "NO!": Vasquez gives one when Drake gets immolated.
Bilingual Bonus: Vasquez wrote on her armor "El riesgo siempre vive!", which means "The risk always survives!". note This may be a reference to a motto of a number of world-famous special-operations military units, which boils down to "Who dares, wins"
Black Dude Dies First: Played completely straight, as Private Frost gets a flamethrower to the face as soon as the squad gets ambushed and Sergeant Apone gets grabbed by aliens in the same scene (though his death is somewhat delayed).
Book Ends: The film starts and ends with a spaceship silently drifting into space, with the crew in artificial sleep - the same as the first film, in fact.
Brake Angrily: Ripley does this when an alien attacks her from the roof of the APC.
Ripley shows that she knows how to use a Powerloader early on, and the scene is played for "Getting to know you" laughs. She later uses that same powerloader to fight the Alien Queen.
Sergeant Apone also orders the floor-mounted airlock sealed near the beginning of the mission. Near the end Ripley uses it to dispose of the alien queen.
The tracking device that Hicks gives to Ripley and she passes on to Newt. Which Ripley uses to track down Newt and save her.
Chekhov's Skill: Along with her knowing how to drive a powerloader, there's the lessons Ripley got from Hicks on how to use the Marines' weapons, which she uses to great effect during her Mama Bear rampage.
Although not shown on screen, as well as showing her how to drive a powerloader, her working dockside also taught her to drive heavy vehicles like the APC.
Climactic Elevator Ride: Ripley rides down an elevator deep into the soon-to-be-exploding colony to rescue a little girl. She takes this time to ready all her weapons.
Continuity Nod: Ripley doesn't recognise the alien engineering inside the atmosphere processor. This is because she never went into the Pilot vessel. The novelisation has her recognising something familiar about it, because the novelisation of Alien included the Deleted Scene where she finds Dallas and Brett imprisoned in alien eggs.
Contrived Coincidence: The LV-426 colony goes off-line just a year after Ripley is brought back. Turns out that's not a coincidence at all, as Burke ordered them to investigate the Aliens.
Creepy Child: Newt starts as one due to the psychological effects of her traumatic experience. Her eerie delivery of the line, "They mostly come at night. Mostly," is often quoted.
Cryonics Failure: Discussed at length as part of Burke's plan to smuggle the xenomorph specimens back through quarantine.
Deus Ex Nukina: The film kicks it up a notch. It was the only way to be sure.
Development Gag: Hudson teases Vasquez by saying "When they said 'alien', she thought they said 'illegal alien' and signed up." Vasquez' actress actually did make that mistake, and showed up to the auditions dressed as a migrant worker.
Distress Call: There's a Cessation of Communications with LV426. Ripley later reveals that she checked the colony logs, and Burke was responsible for sending the colonists out to look for the alien ship from the first movie.
Doesn't Like Guns: Bishop hands back the pistol he's given without comment and proceeds on his solo mission unarmed.
Dolled-Up Installment: The commentary track reveals that this trope was in play. When asked to do an Alien sequel, James Cameron wrote an outline for his thoughts on a film, which was actually based on something he wrote a few months earlier with the Alien characters dropped in.
Do Not Do This Cool Thing: The film is mostly remembered and beloved today for the awesome Space Marines and their dozens of quotable lines showing off their confidence and boasting how they're the ultimate badasses. Most seem to forget the film was basically a Vietnam movie IN SPACE! and the entire thing from the first encounter with the Xenomorphs on shows how underwhelming the Marines firepower is in the face of the alien threat; and after most of their squad is taken out, the comparatively subdued and borderline post traumatic stress suffering performances of the surviving troops shows off how most of their bravado in the first part of the movie was just that, and they're just as mortal and hopeless as the defenseless colonists they were sent in to rescue. That doesn't stop the fact most people who remember the movie have their entire understanding of the struggle of the marine characters begin and end at "LETS ROCK!"
Probably has something to do with the fact that, unlike the real Vietnam War, the humans successfully defeat the Xenomorphs through the use Marine firepower (in the form of a Pulse Rifle/Flamethrower combo and then a Power Loader), so the badassery still stands, just after they've reached a low point and adapted to the situation at hand.
Drop Ship: The two dropships; perhaps one of the first examples of this trope to appear on film. They were designed by Syd Mead who did design work for Blade Runner, and were based on the US helicopters from the Vietnam War. (And refined by Ron Cobb and then completely kitbashed by James Cameron, who was inspired by the Apache helicopter, depending on who you ask.)
Vasquez, about Hudson's belief that the aliens are inside the perimeter.
In the extended cut, Hudson is the one who first theorizes the possible existence of a xenomorph "queen".
He also, during a freakout, says they won't last 17 hours. Even with their precautions, the xenomorphs breach their defenses in less than that. Had they not figured out that they had limited time to escape before the processor exploded, it's doubtful anyone would have gotten away.
The End... Or Is It?: After the credits there is silence and a dark screen. Then the organic squelch of an egg opening can be heard...
Elevator Escape: Ripley and Hicks run for the elevator leading to the landing pad. They push the button and there's a moment of suspense when the doors don't close (it's not as if anyone's left alive to service them) then they start closing until an alien does a Deadly Lunge from the corridor outside, forcing the doors open again. Hicks fires at point black range, killing the alien but spraying acidic blood over his body armour. As a result Ripley has to go and rescue Newt alone, and there's another example when the Queen alien is pursuing them — Ripley barely gets into the service elevator in time, driving the Queen back with her flamethrower just as it's running out of fuel. The Queen is snarling in fury when a second elevator arrives, summoned by Ripley's frantic button pushing...
Empathy Doll Shot: Casey (Newt's disembodied doll head) floating in the water after she's taken by a xenomorph.
Enemy Rising Behind: The abduction of Newt and the xenomorph rising up behind Burke in Medical.
Ripley: How many drops is this for you, Lieutenant? Gorman: Thirty eight...simulated. Vasquez: How many combat drops? Gorman: Uh, two. Including this one.
Epic Fail: The Colonial Marines enter the atmosphere processor without realizing that the central cooling units can be pierced by conventional weaponry - which they only realize after they're knee-deep in the hive and Ripley points it out to them. Then, without giving a reasonable explanation why, Gorman orders the Marines to give up all their ammo (except for flame throwers) to one man, and said Marine happens to be the first casualty when the xenomorphs attack, because the aliens are hiding in the walls and don't show up on infrared. The only reason anyone escaped is because several of the soldiers kept spare magazines and/or carried backup weapons.
Even the Guys Want Him: Applies to an entire species (depending on your interpretation of the term "Arcturian"), according to some dialogue:
Frost: I sure wouldn't mind getting more of that Arcturian poontang. Remember that time? Spunkmeyer: Yeah, but the one you had was a male. Frost: It doesn't matter when it's Arcturian, baby!
Everybody's Dead, Dave: Only Ripley, Newt and a badly-injured Hicks survive (Bishop is still technically "operational", but he's a mess and is missing half his body).
Expository Hairstyle Change: Hudson's spiked-up hair reflects his confidence. After the team is decimated and Hudson completely freaks out, his hair is flat. The front part of it goes up a bit when Ripley tells him to get ahold of himself. When he starts to regain his composure, his hair is more up but still wet and flat in places. When he's fully regained his confidence, it's spiked up again.
This is apparently the fate of Apone and Dietrich, if the explosion of the atmospheric processing station didn't kill them first.
In the novelization, Ripley found Burke in the queen's nest, and left him with a primed grenade when he said that he could feel the chestburster moving inside him.
A similar scene with Ripley finding Dallas takes place in the Alien novelization, which had been based on a scene that was filmed but not ultimately used. (The scene is restored in Ridley Scott's 2003 'Director's Cut' of Alien.) According to fandom, the scene with Ripley & Burke was reportedly filmed, but with subsequent re-releases of the film, the scene has still not seen the light of day. (If the scene wasn't filmed, since both adaptations were done by the same author, he may have wanted to echo the Ripley / Dallas scene for dramatic effect.)
Final Solution: Ripley and later the Marines want to wipe out the Aliens entirely. This is well justified, since the Aliens actually areAlways Chaotic Evil monsters, instead of this just being the excuse of a genocidal bigot. Burke objects to this plan, but not because he thinks they have no right to do so (as he claims at first), but because he wants to collect a live specimen for the Company's bioweapons division and reap a big profit.
In the Special Edition, the "bees and ants" conversation foreshadows the appearance of the Queen.
Hudson: She's badass, man, I mean big.
Newt reckons the scenario will turn ugly again for the humans, despite the presence of the Space Marines.
Ripley: Newt, these people are soldiers. They're here to protect you.
Newt: It won't make any difference.
Ripley promises that she won't leave Newt, "cross my heart and hope to die". She gets a chance to prove that she means it when the xenomorphs capture Newt with only minutes before a nuclear detonation will occur.
Ripley suggests nuking the site from orbit and Hicks agrees. The site ends up nuking itself when the damaged power plant explodes.
Gratuitous Spanish: Vasquez and to a lesser extent Burke tend to mix some proper Spanish terms every now and then.
Homage: The film has several homages to the book Starship Troopers, such as asking if the mission was a "bug hunt", and the female dropship pilot. Additionally, all the actors playing the Marines were required to read the book before filming.
Hudson: Vasquez, you ever been mistaken for a man? Vasquez: No, have you?
Instant Cooldown: Averted. By the time they notice emergency venting from the atmospheric processing station it has already reached a point where it's too late to stop it from exploding even if the cooling systems are fixed.
Ironic Echo: Burke dismisses Hicks as a grunt incapable of making a major decision, but quickly adds, "No offense." Later, after Burke's treachery is revealed and the Marines intend to "waste him", Hicks quickly adds, "No offense."
"What do you mean THEY cut the power? How can they cut the power — they're animals!"
The alien queen shows that she knows full well what Ripley means when she points the business end of a flamethrower at her eggs, and her tearing herself away from her egg sac and coming after Ripley is strongly implied to be out of rage for Ripley killing the eggs.
In the director's cut, the survivors watch as the sentry guns burn through almost all their ammo before the xenomorphs finally "fall back" to look for another way in. Hudson lampshades this by saying "Maybe they're demoralized..."
Karmic Death: The traitorous Company executive, Burke abandons everyone to the aliens — presumably assuming that they really will kill him once they escape — only to run directly into a bloodthirsty alien himself. In a deleted scene (and in the novelisation), Burke becomes the host for a chestburster, the original fate he had planned for Newt and Ripley.
Last Name Basis: Through most of the film. Ripley and Hicks eventually progress to First Name Basis near the end, just before Ripley assaults the Alien hive to rescue Newt.
Ripley: See you, Hicks.
Hicks: Dwayne. It's Dwayne.
Ripley: [beat] Ellen.
Hicks: Don't be gone long, Ellen.
Last Stand: Discussed and shown in the tie-in comic Aliens: Newt's Tale. The Hadley's Hope colonists hole up in a wing of the facility to try and make a last stand against the xenomorphs. It ends...badly.
Late to the Tragedy: Ripley and the Colonial Marines. The settlement on LV-426 has already been wiped out when they get there.
Apone: Sir, this place is dead. Whatever happened here, I think we missed it.
Lock and Load Montage: The film takes this to the next level (and is likely the defining example for the series) - Ripley tapes together a pulse rifle and a flame thrower, grabs as much ammo as she can carry, puts on a bandolier of grenades and stuffs a bunch of flares in her pocket during the dropship ride to the atmosphere processor. She then removes her long-shirt and preps her weaponry during the elevator ride down.
Mama Bear: The last half-hour deals with Ripley defending Newt from the aliens and the Alien Queen defending her eggs from Ripley.
Ripley: Get away from her, you bitch!
Meaningful Name: The noble, nonviolent and self-sacrificing android is called "Bishop."
Mildly Military: James Cameron has admitted that the Space Marines came off as a lot less disciplined than actual Marines; rather, they were more a reflection of Vietnam-era regular Army conscripts. Some specific examples:
During the infiltration of the reactor Vasquez and Drake disobey direct orders from their commanding officer (Lieutenant Gorman) and 2nd in command (Sergeant Apone) and re-arm their smart guns.
During their first encounter with the xenomorphs the Marines panic like a bunch of schoolgirls.
After it's become clear that something is seriously wrong at the colony and hostile xenomorphs may be responsible, Spunkmeyer exits the drop ship, leaving it wide open for any xenomorph that might want to get inside. Naturally one does. It kills both Spunkmeyer and Ferro, thus crashing (and destroying) the drop ship and marooning the rest of the team on the planet.
Mini Mecha: The powerloader, complete with welding torch, hydraulic pincers and docking bay controls.
More Dakka: The film is largely premised on the Colonial Marines attempting to bring heavy military firepower to bear on the xenomorphs. Due to various circumstances including incompetence, overconfident leadership, and deliberate sabotage, they fail to deliver the full extent of this promise. The best examples that get displayed in the film are the smartguns and the automated sentry guns.
Neck Lift: Ripley does this to the alien queen during their fight using the mechanical arm of the cargo loader she's strapped into.
The Neidermeyer: Lt. Gorman, who is unit commander In Name Only. Sergeant Apone is the real commander of the unit, and when he dies, Gorman completely freezes up. He gets better... but it's unfortunately just before his demise.
No New Fashions in the Future: Ripley and Burke's outfits scream 80's, with Sigourney Weaver's curly hair and Paul Reiser's bad perm getting special notice. Conversely, the business suits all have turned-up collars.
After the Colonial Marines learn that some of the ones left behind in the escape are still alive, Vasquez says "Then we go back in there and get them. We don't leave our people behind." Averted, since they don't in fact go back in after them.
Played straight again with Ripley going in after Newt.
Nothing Is Scarier: Despite being more focused on action, the film gets in on this. The aliens aren't even seen until over an hour into the film; before that the Marines are exploring the deserted colony, waiting to encounter them at any moment.
Nuke 'Em: This option is suggested by the characters to deal with the Aliens ("It's the only way to be sure"), but the plot doesn't give them the chance, as the colony's atmosphere processor counts down to a thermonuclear overload all on its own.
Obstructive Bureaucrat: The Board of Inquiry. This is used to mislead the audience, as the only member who expresses sympathy towards Ripley is Carter Burke, hiding his role as the villain.
Hudson's face while Bishop does his high-speed version of Five Finger Filet.
"Game over, man. Game over!"
"This is a big fucking signal...Ten meters...eight..." "That can't be, that's inside the room." ba-beep-beep "It's reading right, man!" "Then you're not reading it right!" BA-BEEP BEEP "Three meters...what the HELL?!?" *eyes go upwards to the drop ceiling*
One-Liner: Being a traditional 80's action film, it features quite a few:
"I like to keep this handy for close encounters."
"What the hell are we supposed to use, man? Harsh language?"
Ooh, Me Accent's Slipping: Carrie Henn, who played Newt, was living in the UK at the time of filming (one of her parents was British, the other American), and apparently picked up some of the accent. Near the end when the protagonists are escaping through the airducts, she suddenly slips into an English accent on this line:
Newt: Up there! There's a shortcut across the roof!
The dropship barely escaping the nuclear detonation on LV426.
Also everyone running out of the way of the crashing dropship, which explodes into flame and rolls right between them.
Parental Substitute: Part of what makes the film so touching is Ripley's 'adoption' of Newt. Ripley, being frozen for 50+ years, lost her daughter, and Newt's family were killed by the Xenomorphs, so the two fill the empty spaces in each other's lives. Newt actually calls Ripley "Mommy" by the end of the film.
Poor Communication Kills: After being alerted to the risk of damaging the reactor coolant equipment with gunfire, Gorman orders the Marines to unload their weapons and give all of their ammo to one guy to carry, leaving them with flamethrowers only. Not being told why they were doing this, and having rather little faith in their commander's abilities, most of the Marines keep some ammo on them and end up shooting up the coolant equipment anyways as soon the fighting starts.
Powered Armor: The Power Loader Ripply uses is an interesting example of one without the "armor" part of the trope, being mostly an open frame used for loading cargo like a wearable forklift. Outside film material implies that Colonial Marines sometimes used an actual armed and armored version of the same technology for special situations, though the marines in the film do not seem to have one in their armory.
P.O.V. Cam: Used with the Marines' helmet cams, linked with the APC to give the CO there a better situational awareness. It doesn't really help.
Product Placement: The Power Loaders are apparently manufactured by Caterpillar, but unfortunately they're not a real product. Ripley is also seen wearing Reeboks.
Redemption Equals Death: Gorman gets a small measure of redemption in keeping Vasquez and himself from being taken alive.
Red Herring: Ripley meets the android Bishop, who she's intensely distrustful of due to her experience with Ash in the first film, and is later seen examining some dead facehuggers. It looks as though Bishop will betray our heroes in the interests of acquiring a xenomorph for the company, just like Ash, but it turns out Burke is the one who really wants to bring in a xenomorph. Bishop was only following his initial orders.
Red Shirt: Easy way to determine Red Shirts: Are they named Ripley? No? They're boned. Frost, Crowe, Dietrich, Wierzbowski, Apone, Drake, Spunkmeyer, Ferro, in that order.
Subverted in the case of Bishop, who is foreshadowed to be one several times, playing on Ripley's prior bad experience, even potentially faking out the audience at one late point when a betrayal seemed the most obvious deduction. However, they are all Red Herrings, he turns out to be one of the most reliable members of the group, coming in at the last minute for a Gunship Rescue. No one is more surprised at this than Ripley.
Retirony: When the survivors are trapped on the planet's surface with little hope of rescue, Hudson wails that he has "four more weeks and out, now I'm gonna buy it on this rock". He's right.
Sacrificial Lion: Practically the entire platoon of Space Marines. The xenomorphs are against serious opposition this time and Ripley tries to reassure Newt by telling her she is now protected by soldiers, but as Newt predicts it doesn't make any difference.
Salvage Pirates: In the opening, Ripley's escape shuttle from the first movie is found by a deep-space salvage crew, who express disappointment at finding her alive, as "there goes our salvage, boys". Averted in that they don't consider killing her and salvage the shuttle anyways.
Ripley screams as she falls into the gravity well with the Queen, and just before the Queen loses its hold on her during the airlock sequence.
And Newt — excusable though as she is just a little girl facing very real monsters. It also saves her life when she's coccooned awaiting the facehugger. Ripley has found her Tracking Device lying on the floor and breaks down in tears, thinking she's dead. Suddenly Ripley hears Newt scream and thus knows exactly which direction to go.
Semper FI: The United States Colonial Marine Corps is the successor to the USMC. A proud and self-described "ultimate squad of state-of-the-art badasses". In line with the parallels to the Vietnam War evoked by Cameron, their superior technology is not enough against a hidden foe with a home turf advantage.
The Colonial Marines sent to find out what happened to the colony on LV426 that has gone silent.
Sensor Suspense: Several scenes with the motion trackers, especially the "They're crawling through ceiling!" scene. And in the deleted sentry scene right before that, seeing the ammo count from the sentry guns decline rapidly.
Sentry Gun: A mini-plotline in the director's cut features the Marines barricading a main hallway and setting up four auto turrets at key locations in two pairs. The first pair fails to hold back the incoming waves of xenomorphs, but the second pair finally convinces them to look for another means to reach the humans within...after being drained to ten rounds in one gun.
Sergeant Rock: Sergeant Apone is one of the most famous examples of this trope.
At Gorman's briefing, Hudson asks "Is this going to be a stand-up fight, or another bug hunt?" This is a direct reference to the novel Starship Troopers, that the actors were required to read, just like real Marines, and was ad-libbed by the actor.
Ripley discovers that Burke sent the colonists to check out the Space Jockey's ship from the first movie, with the company log's reference being 6.12.79. December 6, 1979 was Alien's release date.
There are two references to Stanley Kubrick films. The movie opens with slow, desolate shots of Alien's lifeboat drifting through space, accompanied by music from Aram Khachaturian's Gayane ballet suite; the same adagio is used for the lonely establishing shots of the Discovery in 2001: A Space Odyssey. Later, in the director's cut, there is a scene of people working on the colony on LV-426. In this scene, there is a low angle shot of a child riding on a Big Wheel tricycle. This is a reference to The Shining. This same tricycle was seen in The Terminator, and again in Terminator 2: Judgment Day.
In another Joseph Conrad reference, the Marines' transport vessel Sulaco is named for the town where the novel Nostromo is set.
Ash from the first film is being referenced as a "Hyperdyne Systems" model, which is only two letters away from "Cyberdyne Systems".
Smug Snake: Carter Burke is the slimiest corporate bastard ever.
Ripley: You know, Burke, I don't know which species is worse. You don't see them fucking each other over for a goddamn percentage.
Space Marine: This film trades the civilian astronauts of the first movie for rough 'n ready space marines.
The Speechless: Newt is this until Ripley takes the time to get her some hot chocolate and clean her up.
Suit with Vested Interests: Burke puts a higher value on getting a sample of the creature than he does on the crew. As does Weyland-Yutani as a whole.
Surprise Vehicle: The dropship rising up behind Ripley and Newt during the escape sequence. It takes Newt looking at it and screaming it to Ripley to make her realize it's behind her. In fairness, the place is blowing up around her ears.
Take A Moment To Catch Your Death: When Ripley, Newt and Bishop step off the dropship after escaping LV-426, Ripley takes a moment to thank the android for saving her and the young girl. Bishop replies that he did do good... and then he gets ripped in half by the xenomorph queen, who hitched a ride up with them.
Terraform: The purpose of the Hadley's Hope colony, using massive fusion-powered atmospheric converters to do the job.
There Is No Kill Like Overkill: The Marines and Ripley decide to nuke the colony LV-426 to make sure they wipe out all the Aliens. Averted because not only do the Aliens kill the pilot of the Drop Ship, but the huge reactor blows up in a thermonuclear explosion - making nuking the planet redundant.
Traitor Shot: Bishop gets one that looks like this when he talks with Spunkmeyer about the facehugger specimens kept in the medical wing. He later proves to be a capable support character who rescues Ripley and Newt at a pivotal moment.
Understatement: Burke tries to explain why he didn't warn the colonists what they were looking for:"I made a decision, and it was... wrong. It was a bad call, Ripley. It was a bad call." Ripley immediately calls him out on this.
Ripley: Bad call? These people are DEAD Burke!
Unresolved Sexual Tension: Hicks, the only surviving Marine, flirts with Ripley while teaching her to use a pulse rifle. There's also an earlier scene where Hicks gives Ripley one of the colonist's tracking devices, telling her it'll help him find her if they get separated and awkwardly trying to put it on her wrist. Ripley defuses the situation be remarking that it doesn't mean they're married now, and puts it on herself.
When Ripley leaves an injured Hicks on the dropship to go get Newt they exchange first names.
Video Phone: Burke leaves My Card in case Ripley changes her mind about going on the mission to find out what happened to the colony on LV426. After her next Catapult Nightmare, Ripley sticks the card in her videophone where it automatically connects her to a sleepy Burke.
Wall Crawl: The aliens are shown crawling a ceiling. This has been adapted in later movies and been made extensive use of in the Alien vs. Predator games, as alien players are able to change to wall-crawling mode and thus traverse any surface, no matter if vertical or even upside down by simply walking towards it.
Weld The Lock: The team welds the doors leading to Operations shut to keep out the Aliens. They come in through the ceiling instead.
Did no one save those poor, innocent hamsters from nuclear vaporization at the end of the movie?
The last we see of Ripley's cat is when Ripley tells him she decided to take the mission. In the novelization, she left him on Earth (commenting that only she needed to go back into danger). Given what happens in the next movie, Jones the cat may have the happiest ending of any of the characters in this movie.
Corporal Hicks becomes able to authorize a nuclear attack thanks to alien-caused attrition in the higher ranks, though the company lieutenant was only wounded, not killed, in an incident precipitated by his own ineptitude. When he's up and around again, Lt. Gorman seems to acknowledge his failure of command, allowing Hicks to continue calling the shots.
This also applies to Ripley, thanks to Hicks' low-key command style. The marines defer to Ripley because of her greater experience with the aliens and her more forceful personality compared to the inept Lt. Gorman. Hicks plays along because her orders make sense, quietly providing his own expertise and authority when needed. It's likely not a coincidence that Ripley's (civilian) rank was raised from Warrant Officer to Lieutenant First Class for this movie — more than one reviewer assumes that Hicks regards Ripley as his superior officer. Even the failure to resolve their USTplays into this.
Your Princess Is in Another Castle: Ripley rescues Newt from the Hive, they escape the planet along with Hicks and Bishop just before the fusion reactor explodes, and all seems well. Then it turns out that the Queen Alien hitched a ride.