Easily Thwarted Alien Invasion
"You guys couldn't take over a damn bowl of Jell-O!"
The easiest way to write an Alien Invasion
is to make the invaders nigh unstoppable
by giving them technology and weapons we can't even comprehend
, defend against
If they were just like a human army, it might as well be a war story; there must
be something about the aliens that makes them distinct from any other army.
But the heroes and humanity can't just be dispassionately crushed under a cosmic steamroller, because a Cosmic Horror Story
would be a box office dud due to the bleak narrative and Downer Ending
. Besides, who would want to read
that kind of story?
So what authors do is craft an Easily Thwarted Alien Invasion. To compensate
for the aliens' unstoppable power they build in
and common weakness
that the heroes and humanity can use to beat back this alien menace once it's identified.
This doesn't just apply to armies
, but can be done for individual aliens and non-sentient alien monsters. Maybe their skin is tough enough
to stop bullets
, or they're telepathic
, or they have mind-control
powers, or they have some sort of martial society and cannot comprehend
" or "peaceful coexistence
". Whatever their advantage or power, it's always balanced by a vulnerability to an over the counter product.
And sometimes, that Achilles' Heel
is so serious
that the humans don't even have to figure it out — the planet takes care of them without any help from us at all. The flora and fauna will make them all die naturally without human intervention, be it from the common cold or water or daffodils. Sometimes, the aliens don't even know it's a weakness (or can't conceive of it as one
) until they begin dropping like flies from it.
This can extend to making the cleanup after the invasion a snap. By handing humanity victory on a silver platter
and having an epilogue where the characters happily explain how easy it was to destroy the aliens and return to life as if nothing had happened.
Grimmer portrayals will give humanity one chance to exploit the weakness after they devastate the planet, making the victory a Bittersweet Ending
This trope can sometimes be justified if the "alien invasion" is actually only carried out by a few
individuals, especially if they're completely ignorant about Earth, as is the case in many old Science Fiction movies.
Compare Rock Beats Laser
. See also Weaksauce Weakness
and How to Invade an Alien Planet
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Anime and Manga
- Subverted in Super Dimension Fortress Macross, when just as the main cast finally deduce the aliens' weakness, the Zentradi wipe out Earth anyway.
- Keroro Gunsou:
- While mostly the characters are too lazy to pull off an invasion attempt, when they do you can bet it'll fall apart pretty easily.
- One season finale involved a massive, monolithic alien the size of a city that was defeated when it slipped on a banana peel, which sent it hurtling into the sun.
- Urusei Yatsura has a few of these. The series started with the Oni deciding to invade Earth, but then deciding to call it off if a randomly chosen earthling could beat Princess Lum in a game of Tag. Naturally, Ataru manages to win (even if he does end up unintentionally proposing to their princess in the process). Other invaders include a bunch in a spaceship that got mistaken for a rugby ball (the battering it took, plus the way Ataru chased the princess in charge after being miniaturised into it scared them off). Also there was the time a shapechanging alien came to Earth and tried brainwashing the locals... unfortunately he disguised himself as Ataru... and his brainwashing technique involved pressing his lips against his victim's.
- Heroman. The Skrugg are only around for about a whole of 8 or so episodes, and while they totally destroy the US Government, Joey and Heroman still manage to kick their butts to hell and back in a timespan of two or so days. Also subverted near the end of the series, where they're not just back, but even stronger.
- Toyed with in Blue Beetle, with the Reach, a race of invaders who know they're easily thwarted... so they come on like friendlies and engage some very long-term planning that will give them the planet in a couple of hundred years. When their plans are exposed, Earth's governments (DC Earth being no stranger to alien invasions) immediately demand the Reach's surrender. They get it.
- In JLA: Year One the ruler of a planet of elemental giants sends seven of his greatest warriors to a certain backwater planet for a grand battle to decide the new leader. The battle never happens; all seven are defeated by local superheroes within minutes of their arrival. The warlord decides that Earthlings are too dangerous to live and orders a full-scale invasion. And is, of course, beaten.
- Of all the aliens in the Marvel Universe, the easily thwarted award has to go to the shapeshifting Skrulls. Their first appearance in Fantastic Four #2 sees Reed Richards tricking them into thinking Earth is too dangerous to invade by showing them drawings of monsters. In Secret Invasion, which sees the Skrulls throwing hundreds of advanced warships, dozens of overpowered Super Skrulls, and a new technique for completely undetectable shapeshifting, they ultimately lose after a small skirmish in Central Park and The Incredible Hercules leading a team of Divine champions to kill the Skrull's gods. When you have to kill gods to beat the bad guys, it's kind of debatable whether they count as "easily thwarted".
- Similarly, in an early comic, an alien lands on Earth with the intention of conquering it, but just happens to run into Thor, who promptly defeats him in battle. Thinking Thor is a native of Earth, the alien falsely belives that the entire human race is as powerful as him and he flees.
- Played for Laughs in another storyline in which an alien invasion is thwarted by three X-men. The ground assault is derailed since the soldiers are introduced to the wonders of beer and gambling, and the entire fleet is wiped out by a drunken Havoc.
- Played with with the Vespa in Irredeemable. At first, it seems that one lone Badass Normal hero snuck into their ship and forced them all to leave Earth just when things looked grimmest. Turns out he struck a Deal with the Devil with them instead.
- Subverted in Paperinik New Adventures: at first it seems that the might of the galaxy-spanning Evronian Empire is being held back by Paperinik, AKA Donald Duck's Super Hero alter ego (they were risking their first defeat ever, according to the commander of the invasion force), but as the story progresses it's made clear that, due a combination of rebellions among their subject species and one of their previous successes unleashing the sci-fi equivalent of a Physical Goddess against them, they're overstretched to the point the Humans can beat back a direct assault, and Paperinik is doing nothing more than thwarting their attempts at soften up our defences.
- In the classic horror movie The Day of the Triffids, the eponymous carnivorous plants are killed off by sea water. Contrast with the original novel in which the invasion isn't thwarted, the survivors instead having to adapt to the Cosy Catastrophe.
- Independence Day. A fleet of scientifically advanced homicidal aliens has its force field defense taken out by a computer virus uploaded from a Mac, allowing the humans to blow up their base ships by attacking the ship's primary weapons as they fire.
- Justified by the aliens' reliance on their innate telepathy resulting in their telecommunications technology being comparatively less advanced (hinted at in the opening scenes where the aliens use humanity's communication satellites to coordinate their attack, rather than their own ships, suggesting that they in fact did not have an equivalent capability on their own). The character in question tested his virus and his laptop on the recovered alien ship first, suggesting that either he or the scientists had already hacked the alien OS. Either that or human computer programming was inspired by leaked alien tech.
- Also, it's a safe bet that none of their prior victims had the opportunity to reverse-engineer their technology and use it against them. (If they had, the events of the movie probably wouldn't have happened.) These aliens rely on shock-and-awe tactics to eliminate the major threats before they can respond.
- The More Than Mind Controlling viral aliens in The Invasion had, in a matter of three or four days, infiltrated most of the Washington population and (going by the Shuttle debris pattern) must have had agents all over the US and the world, painting a scenario where humanity will inevitably fall no matter what it does. But, the heroes discover that some people who had a rare kind of bacterial infection in the brain were resistant to their virus, and in a matter of hours after delivering one such person had created a Magic Antidote which they delivered to everyone infected via dispersing it in the air. The film concludes with a near Reset Button, one character points out that we might never find and cure all infected individuals, but notes that we are in control of the planet because there are still wars.
- Humorous example: Mars Attacks!! and yodeling.
- In Signs it turns out plain old water is pretty much a deadly acid to the aliens. Yes, they clearly felt like a challenge invading Earth. Although their weakness is not really that necessary given that this is a race that can be stopped by a pantry door that probably wouldn't have kept a determined human in. Amazingly, they conduct their invasion unarmed save for a natural poison gas gland on their wrist that exhales a small amount of localized gas. And worse still the aliens also forgo armor or clothing of any kind. It's like if humanity invaded an acid-covered world, with frequent acid rain and despite the hostile environment decided to engage the natives naked.
- Evolution had the aliens thwarted by Head and Shoulders Shampoo's Selenium Sulfide.
- Prince of Space. The chickenmen of Krankor are able to travel half a million miles to invade Earth (even though their fuel capabilities lag far behind ours) where they have their asses handed to them repeatedly by a man who has no superpowers, but can skip reasonably well. Turns out that their weapons have no effect on him.note
- Aliens in the Attic runs on this.
- Averted in Man of Steel. Superman was more powerful than the other Kryptonians but through combat expertise they were largely able to come close to killing him at a few points, and successfully held off the military. Even Sensory Overload was something that they could manage. Humanity would have been completely terraformed out of existence if weren't for Superman, Lois Lane, Jor-El's digital avatar and brave soldiers working together. Fittingly, almost none of the Kryptonians died at the end of the movie, and were only banished back to the Phantom Zone. By contrast, a lot of humans—soldiers and civilians alike—lost their lives.
- Harry Turtledove's short story The Road Not Taken posits that the secret of interstellar travel is an absurdly simple technological concept (so much so that it seems obvious in retrospect, like the wheel), and yet Earth, by sheer happenstance, never stumbles upon it. Later, Earth is invaded by aliens in wooden spaceships armed with cannons and black powder muskets... who are confronted by humans who, having never discovered FTL drives, have instead devoted their research to other scientific pursuits, such as weapons that outclass the invaders' by centuries of development. The story ends with the captive aliens horrified that the humans will be able to discover the secret of hyperdrive from their ship, unleashing the violent, tremendously advanced (compared to other species) humans upon the rest of the galaxy.
The sequel picks up a thousand years later, when the human race (now stagnant for the same reasons as everyone else) tries to invade a race that still hadn't found the trick, but were now advanced enough that they don't need it to carve out an interstellar empire.
- In the Worldwar series by Harry Turtledove, the Race, lizardlike alien invaders, intend to avoid this by showing up loaded for the bear. Their probe showed mounted knights on horseback, spear wielding tribesmen, and wooden ships. Thus, they brought automatic rifles, tanks, jet fighters, and nuclear weapons. The time between their probe sending them the information and the invasion force arriving was 800 years, but things don't move on much in that kind of time, at least not for the Race and the other three planets they've conquered. Unfortunately for them, "Tosev 3" is different. The invaders show up in the middle of World War II to find humans not able to match them one for one, but certainly able to compete with them and defeat them, especially when the humans vastly superior numbers and willingness to sacrifice themselves in droves come into play. Then winter rolled around, and the Race realized that, compared to their home planet, Earth is REALLY cold during winter. Especially in Russia. It turned an expected walkover into the aliens having to be content with conquering only parts of the planet that couldn't fight back effectively, or were in the equatorial belt and warm enough for continuous operations.
- Subverted in When The Tripods Came, the Tripods prequel. The first three Tripods are easily destroyed, and everyone believes this trope. But then The Trippy Show comes along, and...
- Out of the Dark by David Weber goes along a similar premise to World War except that it takes place in the modern day and humanity is pretty much screwed, up until Vlad Drakul wakes up and kicks alien ass.
- Anne McCaffrey loves this trope.
- In the Freedom series, the preferred host species of the Eosi (body-snatching Evil Overlords) is deathly allergic to a plant that grows in abundance on Botany, the planet the main characters were stranded on. La Résistance manages to sneak boatloads of the plant's pollen into the ventilation system at a suspiciously fortunate gathering of 90% of the Eosi. The surviving Eosi were too few and scattered to retain their grip on their servant races.
- In the Acorna Series, the Khleevi (Always Chaotic Evil planet despoiling insectoids) are easily cowed by one squadron of battleships fighting back (though they were portrayed as bullies who preferred easy targets). And, after that, the heroes find a plant whose sap acted like purest acid on Khleevi exoskeletons.
- In the Talents series, the Hivers (a more rapacious version of the Buggers from Ender's Game) prove to be completely unprepared for human telekinesis. Later, humanity found a pheromone combination that turned the Hivers from Borg-like aggressive conquerors to more docile, agrarian types.
- In the Dragonriders of Pern books, Thread is a ravenous mycorrhizoid spore that can eat virtually anything carbon-based and burrow into the earth. But water (even a good soaking thunderstorm) kills it, as does fire and cold. In one book, the Pernese don't realize that Threadfall has started because the first few falls are over the northern area of the continent during winter. Also grubs, but those were genetically engineered.
If it seems improbable that Thread could ever live on any planet with anything worth eating, that's because it is. It's a deep-space organism which only falls on Pern due to a very unfortunate accident. Once Thread falls, it's doomed — but it can still do a hell of a lot of damage before it dies.
- Battlefield Earth had a very specific set of weakness that made their occupation of Earth (not the invasion itself) easily thwarted... as well as the annihilation of their race. The gas the Psychlo breathe combusts in proximity to radioactive materials, but no alien race fighting them was ever in a position to best them militarily and get a nuke near them (only a nuclear device could combust an atmosphere's worth of gas). As it turns out their teleporter net connected all of their planetary holdings everywhere, so if a nuclear device were smuggled on their homeworld and the detonation was timed to coincide with these teleporters activating it would incinerate every Psychlo in the universe. Luckily for them, no aliens could get near their conquered planets, and none had the intimate knowledge of Psychlo technology and organization to pull it off... until one of them gave a human the smarts to figure it out.
- In a straighter application of this trope, Johny is inspired not to think of the Psychlos as invincible when Terl shows him the site of greatest military resistance... the US Air Force Academy. The cadets had figured out the Psychlos were using nerve gas and wore gas masks, and proceeded to put up quite a fight until overwhelmed by numbers.
- Granted, "quite a fight" is sort of a misnomer. They conquered Earth (according to the movie) in three minutes. So this "quite a fight" must have been all of two minutes long. Not to mention the fact they annihilated our military in three minutes implies they had hella fast deployment capabilities... which, if you think about it, makes sense as they could probably use teleporters to just beam down a few tens of millions of dudes.
- The Psychlos actually put a radiation detector on their transporter with it programmed to not transport anything radioactive. When the nukes were sent in the teleporter detected radioactive material and activated a quarantine shield; the issue was the humans kept teleporting in nukes, and the planet had been so thoroughly mined for resources, with so many holes left over from mining, that the blasts reached the core of the planet and (somehow) made the core react explosively, destroying the entire planet.
- In the proper application of this trope, when the humans see the airplanes (Which had been previously ineffective), they are able to easily learn how to use them and fight the Psychlos successfully. Despite having learned how to use these things in a matter of weeks and them not having worked the last time.
- In Arthur C. Clarke's Space Odyssey series, the godlike aliens who blow up planets and mess with humanity's evolution from apes are found to be vulnerable to computer viruses... the code for which are buried in a mountain on the moon.
- However, the supercomputer that the virus is uploaded to helped humanity upload it.
- Also, it is explicitly explained that the viruses in question are not just your regular run of the mill viruses - they exploit the laws of mathematics such that ANY computing system that uses numbers is vulnerable, no matter how advanced, and NO countermeasures of ANY kind are possible.
- The supervirus were described as working by tricking the target computer into attempting a calculation that was impossible to complete meaning that they could in theory work against any calculating system no matter how advanced. However they presumably can be stopped at the point of infection by a good firewall like any other virus, which was probably how they were in the end contained and put into the lunar vault with all the other weapons of mass destruction. The target was the monolith, which was just a single machine, a single mostly autonomous tool of the aliens, not the alien civilization itself, and in fact had been corrupted and damaged after millions of years of wear and tear which may have made it more vulnerable. But even then humanity would have had no hope in hell of successfully infecting it at all without Halman's help. The conclusion of the last novel also left it ambiguous as to whether the supervirus actually worked or not, or was even necessary. (The monolith may not have been planning to destroy the solar system at all and humanity was just being overly paranoid. The supervirus might have failed completely and the monolith left the solar system because that was what it was intending to/instructed to do all along. Alternately the monolith was destroyed by the supervirus, but fights it off long enough to send a You Suck message to humanity, and call for reinforcements, which presumably would arrive sometime around 5001.)
- Older than Television: The War of the Worlds did this with bacteria. In fact, it's pretty much the Trope Maker and Trope Codifier for the "The planet takes care of the invaders itself" version of this trope.
- The novel implies that the Martians were severe germaphobes who rid their native habitat of all microbial life, thus blessing themselves with major suck right before the invasion of Earth.
- In Wells' defense, he was writing before the discovery of antibiotics. Prior to WWII, far more soldiers of any invasion died of contagious diseases than battlefield injuries, and even in peacetime the British Empire lost scads of troops to malaria, yellow fever, and other tropical ailments in its overseas possessions. So the Martian imperialists weren't suffering from anything that Europe's own imperialists hadn't. (Wells took a dim view of imperialistic expansion.)
- Subverted in The League of Extraordinary Gentlemen: Book II, where the bacteria which kill the Martians are actually products of Dr. Moreau's genetic engineering and hybridization.
- The Hitchhikers Guide To The Galaxy
"For thousands of years the mighty starships tore across the empty wastes of space and finally dived screaming on to the planet Earth - where, due to a terrible miscalculation of scale, the entire battle fleet was accidentally swallowed by a small dog."
- Robin Cook's Invasion had the Body Snatcher-esque aliens are thwarted by the release of a rhinovirus, AKA the common cold.
- Keith Laumer wrote a hilarious short story in which aliens invade a dying civilization — only to discover that the locals were in fact immortals whose metabolisms shut down if they didn't get enough of a certain gas in their air. Guess what the invaders exhaled. And the locals who were still up and about were the weakest of their species; the invasion revived all of their brawny Badasses.
- The invasion of the Gorg in The True Meaning of Smekday. For some reason, the Gorg try to kill every single cat on planet Earth. As it turns out, the Gorg are allergic to cats.
- The Body Snatchers, the short story upon which the film versions were written, had the aliens simply give up when the figure out they can't tolerate human resistance. The films tend to end on a darker note...
- Rather than a single cataclysmic event, Christopher Anvil's short story The Gentle Earth covers a long campaign in which the invaders are slowly worn down, but they're defeated in such a thorough and humiliating fashion that it goes under this trope anyway. Their errors and catastrophes include but are not limited to failing to prepare appropriately for Earth's much colder winters, dismissing tornadoes as a legend (having landed in Tornado Alley), and drastically underestimating Russia's missile supply.
- In Stephen Baxter's novel Space has the solar system invaded for use as an stellar fuel depot by the Crackers, which will result in the explosion of the sun. Having battled through the friendly Gaijin fleet, they are utterly destroyed by Nemoto's secretly modified and transplanted Moon Flowers, which use the top layer of Mercury's soil as cosmic buckshot.
- Averted in Greg Bear's Forge of God where humanity is totally screwed even before we realize we're under attack, have absolutely no way of even inconveniencing the invaders even a little bit even after we find out, and the total destruction of the Earth is a foregone conclusion from essentially the first page. In the end we nuke a few decoys but never even see the aliens or their principle weapons. A few survivors are rescued at the last moment by another perhaps more benevolent alien race, but at least according to some interpretations of the sequel, it was only to be used as pawns and cannon fodder in a wider galactic war.
- Arrivals from the Dark: In Mikhail Akhmanov's Invasion, the super-powerful alien starship wipes out a large chunk of Earth's fleet and shrugs off a nuclear Macross Missile Massacre without a scratch. In a Deus ex Machina fashion, a different alien teleports onboard and gives the hero a device that destroys the ship's brain, shutting down all systems. In a brutal subersion of No Endor Holocaust, many major cities get hit with smaller falling alien ships full of antimatter, with the casualty count in the tens of millions, not to mention all the material damage. Earth recovers remarkably quickly in the sequel, though.
- Lampshaded by the character of Zellaby in John Wyndham's The Midwich Cuckoos (1957), where he brings up a few examples of this trope common in British and American science fiction at the time in a strategy discussion. He then concludes the alien invasion they face is a war like any other, and takes the appropriate measures.
- The Sirens of Titan by Kurt Vonnegut features a Martian attack on Earth. The Martians originate from human colonists and appear to be extremely well-prepared and equipped, but several mistakes in their plans make it extremely easy for Earth to repel the invasion.
- Averted by the New Jedi Order series, in which it takes nineteen books spanning five years of war to defeat the Yuuzhan Vong. It's not until the New Republic/Galactic Alliance readopts asymmetric warfare strategies and combines them with Imperial tactics (like orbital bombardment) that the tide turns permanently.
- A novel titled Invader (can't remember the author) had humanity's astronomers spot the massive energy release as the invasion fleet slowed from near-lightspeed, so the world's governments funded the construction of a massive gamma-ray emitter. One carefully-aimed shot killed every living thing in the fleet, and the now-dead ships just drifted past Earth back into the void.
- The High Crusade: Invaders landing in England in AD 1345 can only defend themselves against energy weapons, leaving themselves helpless against swords and arrows.
- Lost in Space episode "Invaders From The Fifth Dimension" features Will Robinson abducted by a group of aliens who are repulsed by the sight of tears due to being unable to understand emotions, and eventually let him go as a result.
- The episode "Politics" of Stargate SG-1 is about a Senator who believes that the Goa'uld are this, thus wants to cut SG-1's funding. He's not entirely wrong but underestimates the Goa'uld considerably since SG-1 keeps coming back alive. Destroying the Goa'uld by uploading a computer virus to their ship is sarcastically mentioned.
- The TOS The Outer Limits episode "Specimen: Unknown" had alien plants that release a deadly gas and spread like wildfire... literally. A spaceship carrying them crashes on Earth and it looks like the human race is doomed. Worse yet, a thunderstorm is brewing overhead, and the plants will spread even faster when they get some rain, right? Wrong. The rain causes them to shrivel up and die, and the world is saved. Think of it as the opposite of a Cruel Twist Ending.
- Star Trek: The Original Series episode "Day of the Dove". An alien powerful enough to destroy a Klingon battlecruiser, transmute matter and control the minds of hundreds of beings simultaneously takes control of the Enterprise. How do the humans and Klingons get rid of it? By laughing at it. Seriously.
- Most alien invasions in Power Rangers. Almost universally taken out by "teenagers with attitude". Also, supersuits and giant robots.
- And not much in the way of attitude, when you get down to brass tacks. Nonetheless, five teens restricted to a single city with no military skill or training whatsoever fend off entire armies that know where they live, who they are, and what they like to do in their free time.
- Doctor Who loves this trope, with dozens of aliens invasions ranging from single vessels to vast fleets (The World Is Always Doomed, after all) being Easily Thwarted by a single man with unusual dress sense. The spin-off series The Sarah Jane Adventures plays it even more straight than its source material.
- This generally reaches its extreme whenever the Doctor fends of Dalek fleets. For reference, Daleks are the scourge of the universe, with precious few civilizations being able to stand against even small amounts of them.
- The Science Fiction Sketch of Monty Python's Flying Circus, in which blancmanges from Andromeda seek to win Wimbledon by turning everyone in the world into a Scotsman. They were thwarted when two people ran out onto the tennis court and ate the blancmanges. It would have been more easily thwarted, but the camera rudely cut away early in their first appearance.
- This trope is referenced in Farscape when the crew of Moya ends up on Earth.
D'Argo: (gently) I've seen lots of your movies. And in every film - the aliens are always evil and Earth always is victorious.
Bobby: You mean we have to learn there are good aliens?
D'Argo: (long pause) No - I mean you have to learn you won't always win.
Both John and Aeryn also note in the episode that Earth's defenses would be woefully ineffective if any alien race decided to attack.
- Referenced in the Mystery Science Theater 3000 episode Prince of Space. After the villain, Krankor, announces his plans to conquer the Earth, we cut to newspapers flying off the presses and the 'bots imagine the headline:
Crow: "Krankor: Nothing to Worry About!"
- A Saturday Night Live sketch from the '80s ("Target: Earth") featured an invasion by a race that has a spaceship... but in every other way appears to be far less advanced than Earth.
1st Alien: So, what is your answer? Do you agree to come quietly and be our slaves or do you face the awesome power of our muskets?
- Subverted in City of Heroes- the extra-dimensional Rikti invaders turned out to be vulnerable to magic, so they targeted magic users as soon as they found out. Their invasion still caused massive devastation, though not quite to After the End levels, and decimated the Superhero population.
- And then they started learning how to use magic themselves.
- Averted entirely in Universe at War - The tutorial mission is the only time you play the humans and its Unwinnable; Earth has to be rescued by other aliens.
- In the original X-Com, the aliens' weakness is logistics. They simply don't have enough forces available at the beginning of the game to launch more than a couple of small missions a month (though their forces build up more and more later), requiring them to operate in secret through infiltration and subversion of national governments, showing the world that X-Com is too weak to defeat them and attacking and destroying X-Com bases instead of open warfare. Meanwhile, even one crashed alien craft allows for humans to import their phlebotinum, and enough research allows them to take the fight to the alien base on Mars.
- The Remake is an aversion. Your teams note that if the aliens really want to invade us they could do so easily and must have other plans they do.
- Xenonauts has its first research consisting of explaining "Why we haven't already lost."
- The Aliens are invading a planet that is nothing like the ones belonging to any of the constituent alien species, Higher oxygen levels, thicker atmosphere, ETC, ETC.
- The Alien ships need to be refitted for atmospheric combat, which is logistically intensive, and time consuming, forcing them to rely on small scout craft for the early phases of the invasion.
- Ultimately, this gives humans time to research, and reverse engineer their technologies, to hopefully stop the alien invasion before it gets intense enough to actually become a full scale invasion, which is less then a year.
- The Rhombulans in Elite Beat Agents are so vulnerable to music that rhythmically beat garbage can lids is enough to knock out their soldiers. The easily-thwarted part happens when you remember what genre this game belongs in, at least from a story point-of-view.
- The Half-Life series averts this. The scientists in Half Life 1 come up with two plans that they hope will Easily Thwart the invading Xenians, but the first is countered by the invaders, and the successful execution of the second plan actually has the opposite effect, and causes millions upon millions of Xen creatures to be teleported all over Earth. The best part? All of this interdimensional activity attracts the interest of a nigh-unstoppable alien empire known as the Combine, who then conquer Earth in an invasion known as the Seven Hour War.
- The Shroobs in Mario & Luigi: Partners in Time. Right at the very end of the game, baby Luigi's crying on a Shroob Mushroom reveals that the Shroob materials dissolve when exposed to baby tears. The present-time E. Gadd creates an unmeasurable amount of water with the same composition as baby tears in response to this. He then pumps it through the time-holes, saturating the past Mushroom Kingdom in baby tears, completely removing any traces of the Shroobs from the Mushroom Kingdom. However, it seems Bowser had Shroob-napped a few survivors and put them in the deep freeze, to be battled in the next game of the series
- In Earthbound Zero a troupe of three small children (albeit with Psychic Powers) defeats an all-powerful alien by singing.
- What about the sequel Earthbound where the said alien is defeated by prayer?
- In both cases, it's more of a sort of softcore Mind Rape performed on Giygas than a Weaksauce Weakness, due to the circumstances.
- Regardless of the tactics used to defeat Giygas himself, a group of 3 or 4 children basically are capable of fighting off everything Giygas can send at them in a more traditional sense.
- Averted in the second Dawn of War 2 expansion. In the previous games, the heroes kill the alien Hive Tyrant, destroy their fleet, kill the ork warboss and even take out both the Grater Daemon and the Chaos Lord that tried to free it, so everything is okay, right? WRONG. Ten years later the war rages on with no end in sight and the situation is so grim that the Empire decides to just nuke the entire sub-sector. This is, naturally, par for course in Warhammer 40,000.
- The premise for the Dawn of Victory mod for Sins of a Solar Empire is loosely based on the Worldwar series by Harry Turtledove (see Literature). The Scinfaxi (not their real name) are a vast interstellar empire, who set their sights on Earth. Same deal, their invasion force arrives centuries after the initial probe, and they land in the middle of WW 2. However, their tech is more akin to the aliens from The War of the Worlds. Despite being shocked at humanity's rapid technological progress (Scinfaxi are conservatives when in comes to progress), they manage to conquer most of the world before the Russians manage to steal one of their nukes and blow it up. The Germans and the US follow suit, scaring the aliens into retreating to the southern hemisphere. A century later, humans abandon Earth and nuke the hell out of it, to kill any Earthbound Scinfaxi. Thus begins a war between the aliens, Soviets, Germans, and Americans... In SPACE!
- Subverted in Sword of the Stars when the Hivers first struck humanity, they soon respond by launching hundreds of nuclear missiles, forcing the Hivers to turn tail.
- The Qularr invasion in Champions Online features as the tutorial. They aren't wiped out, but it seems most of their fleet attacks a single city and are driven off when their mothership is brought down. They are generally kicked around by all the other heroic and villainous groups; one open mission is called Nadir Of The Invaders.
- Averted big time in StarCraft; whenever the Zerg invade a planet, it's usually incredibly hard, if not downright impossible, to stop them. Even when the Protoss manage to kill the Overmind by the end of the original game, the extension reveals that it still didn't put an end to the invasion, and the last protoss survivors are forced to leave to save their skins. The only time they managed to end a Zerg invasion in a relatively short time was in the Brood War Protoss campaign, and only thanks to the combination of three powerful MacGuffins.