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Bizarre Alien Reproduction
Not how it would work in real life.

Wuffles: You are misinterpreting what you saw, Pieter!
Pieter: I saw the tentacles! I know what that means!
Wuffles: My reproductive organs are in my mouth! It doesn't work that way!

Okay, you've got your Humanoid Aliens. But no matter what you do, they don't seem alien-y enough. So you add some Bizarre Alien Biology. What's the easiest way to do this? Sex! Guaranteed to appeal to somebody, and if done right, it can look like something other than just being a pervert or possibly Fanservice. It should be added that no matter how deviant it seems to us, Good People Have Good Sex and this counts as good sex, even if it is interspecies.

Sometimes related to G-Rated Sex. May fall into Artistic License - Biology, if the reproductive method fails to generate enough offspring to maintain a population. Note for examples to not include anything related to cultural practices; we're limited to the biology of reproduction here. Put Non-Mammal Mammaries, Exotic Equipment, and Mr. Seahorse on their own page, please. See also Face Full of Alien Wing Wong.

Supertrope of Bizarre Alien Sexes. Compare Bizarre Sexual Dimorphism.

Examples:

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    Anime and Manga 
  • The Twelve Kingdoms has a truly weird reproductive system involving marriage but apparently no sex: when you get married, a fruit called Ranka grows on a tree, and out of it pops your baby. What makes it far weirder is that sometimes the Ranka fruit gets blown across the sea and is implanted in a Japanese woman - this is how the central character of the anime, Youko Nakajima, would have been born, though she thought she was a normal Japanese girl until she was taken by force from her high school. In addition, royalty and other immortals can't marry - and since Nakajima becomes a queen, that includes her - and so they can't have children unless they were married before they become immortal. While it's established that they DO have sex it's apparently only done for fun, with no connection to the reproductive process at all.

    Comic Books 
  • The X-Men have fought The Brood, a race of intelligent Captain Ersatzes of the creature from Alien. A human implanted with a Brood egg will eventually be physically (and mentally) transformed into a Brood member, and will retain any genetic-based abilities (e.g. mutant powers) the victim had.
  • In Phil Foglio's Buck Godot: Zap Gun for Hire's "The Gallimaufry" storyline, a male alien Pog member named Qvakk states that he loved Oort, another male of his species/race, and was "gonna take him home, make lots of eggs".
  • Transformers in IDW's Transformers comic have a truly bizarre reproductive cycle that doesn't even involve sex of any kind. There are "hot spots" on Cybertron and it's moons where sparks form and are promptly "ignited" by an energy pulse from Vector Sigma, the life-giving core of Cybertron. Once the sparks are lit they are carefully removed from the ground and placed within the cybertronion's constructed body. This is referred to as "forging" and is the natural form of reproduction for them. They can also artificially reproduce through cold construction, which involves surgically removing a portion of a spark and using it to grow a new one that is promptly placed into a body. There was much bigotry towards cold constructed bots in Cybertron's old days (to the point of there being a cybertronion apartheid) as they were seen as blasphemy towards Primus but it's more or less died out after the Great War.
    • This trope is also deconstructed; this form of reproduction is so bizarre and impractical that when the life-creating pulsewaves from Vector Sigma started dwindling to a stop, it put the cybertronion race in serious concern about the future of their existence. By the time of the comics all of the hot spots on Cybertron have stopped creating sparks (there are hot spots on some metrotitan-created colonies but it's not said if they're still working). This, alongside the Great War, has greatly reduced the cybertronion population, making them an endangered species in galactic terms.
    • We later learn in More Than Meets The Eye that cold construction actually involves taking essence from the Matrix (an ancient artifact) and using it to grow sparks in a lab, making transformer biology even weirder.

    Films — Live-Action 
  • The Xenomorph lifecycle in Alien goes roughly as follows:
    • Queen lays eggs
    • Egg waits for host (Human, Predator, Dog Etc) to come by
    • Egg hatches, facehugger crawls out, jumps on host's face.
    • Facehugger hangs on to host's face for day or two, host unconscious, facehugger keeps Host alive but tightens tail around neck if attempt to remove facehugger is made.
    • Facehugger lets go and promptly dies.
    • Host acts normal for another day or two (may/may not be aware of pregnancy).
    • Chestburster bursts out of chest, with some of host's DNA (eg; Chestburster from dog becomes quadripedal drone instead of bipedal drone).
    • Chestburster quickly grows up into either Drone or Queen.
    • If Queen, cycle starts again.
  • Although not actually alien, the creatures from the Tremors series have a bizarre life cycle that qualifies for this trope. Eggs hatch into dog-sized "dirt dragons", which transform into bus-sized "Graboids"; multiple bear-sized "shriekers" (each capable of rapid parthenogenesis) burst from the mature Graboid; mature shriekers pupate, then emerge as "ass-blasters", which lay eggs. It's unclear whether there's any actual sex required at all.
  • In K-PAX, K-PAXians are known to have a very painful mating experience, "like having your nuts in a vice, but all over". The process also involves nausea and a terrible smell.

    Literature 
  • The Khommites from the Star Wars Expanded Universe can only reproduce by cloning. They also only eat dietary supplements.
    • And Selonians have one fertile female and a handful of males per 1,000 births. They're subterranean mammals; the queen and the males - presumably not from the same colony - basically do little but breed while the rest of the colony runs civilization. A little like naked mole rats.
      • Humans and Selonians can apparently be allergic to each other. Or at least Corran and that one Selonian were.
    • Falleen pheromones work on anything in the galaxy.
      • And Dathomiri women can use the Force to arouse men and then you know the rest. Teneniel does this to Luke. While he doesn't like it, he still talks to her afterward.
      • Zeltrons, Pink Skinned Space Babes that they are, have a sexual attraction to Force-sensitives. If there's one thing the Expanded Universe has driven home, it's that a lot of people have been attracted to Luke even before he married Mara - though for his part, he was politely disinterested in most of them.
  • Animorphs: Yeerk are implied to have No Biological Sex, but have a form of sexual reproduction: three individuals fuse into one, which then disintegrates into hundreds of "grubs" which develop into baby Yeerks. (Occasionally one grub will turn into twins.) The Yeerk parents die in the process.
    • The Skrit Na are even stranger. The "Skrit" look sort of like giant roaches and are fairly stupid. At some point during their lives they spin a cocoon, die, but then out of their dead body a Na (basically a Grey) pops out. It's never explained where new Skrit come from, but the Na certainly have a weird way of coming into this (or some other) world.
  • From Everworld: male Hetwan, though usually little more than perfectly obedient drones for their deity Ka Anor, will immediately go nuts and mate with any female they see, which looks like a living collection of guts. A collection of eight to ten offspring are born immediately—-which is good, because the males rip the females to pieces while having sex.
  • Though they can breed perfectly fine with humans, Martians in the Barsoom series lay eggs for some inexplicable reason. Yes, even the Half Human Hybrids.
  • When asked, the Puppeteers of Known Space say they have three sexes, but its not quite accurate. What they have is a "sperm depositor" male, an "egg depositor" male, and a non-sentient female belonging to a related species (in the same way humans are related to monkeys). The Puppeteer ova is deposited in the flesh of the third species, the egg is then fertilized, and when the egg hatches, the infant puppeteer eats its way out of the body of the "female", like a digger wasp.
    • Actually, pretty much all species in Known Space other than humans (and other hominids) and dolphins have a pretty thin time of it when it comes to sex. It's kind of Niven's trademark. It's likely that the Moties, who die if they don't get pregnant, were Niven's idea rather than Pournelle's.
    • The hominids of Ringworld kind of make up for it by having robust interspecies sex a regular part of trade and politics.
    • See also the Fuxes (below).
  • The Doctor Who New Adventures novels suggest that Time Lords are all sterile and are "born" from a "Loom", a machine in their giant sentient semi-organic family Houses. Each Loom weaves Family members according to a common template, ensuring that they're related; every Family member is a genetically a cousin to each other.

  • The Pequeninos of Speaker for the Dead, the sequel to Enderís Game. To reproduce, the male has to be ritually vivisected to turn into a tree. Infant females are brought to the Fathertree and crawl around on its bark, absorbing sperm through its dust. Also: any female that survives to adulthood is completely sterile; the young eat their way out of the infant mother's body. Both male and female young are nursed in the Mothertree, which is what happens when a sterile adult female turns into a tree, which exudes a highly nutritious sap the young feed on until they're large enough to walk around on the ground.

    In fact, all native life on the planet is like this (for example, there are no male herd animals—the grass they graze on fertilizes the females). They were changed by a virus, brought to their planet by other alien species. All species who didn't develop bizarre reproductive cycles died.
  • Vonda N. McIntyre's Starfarer series has the squidmoths, who are born male. The males exchange sperm packets with each other and keep the packets they receive (the packets can stay fresh for a long time). At some point the male consciously chooses to undergo a metamorphosis which turns him female, consumes the collected sperm packets, lays eggs, and dies.
  • The alien city dwellers from Blind Lake have two stages in life. The sentient adult form is neuter and has a special feeding apparatus which the parasitic larval form require in order to survive. It's the larvae that actually do the breeding. On occasion, a larva is infected by the virus present in the adults and will transform into an adult itself.
  • The mantis-like Ki! from Chess With A Dragon are hermaphroditic parasitoids, who implant eggs in "host-grubs" of various non-sentient species including feral human children they only think are dumb animals.
  • One of the Star Trek: The Captain's Table books presented the Anjiri and the Nykkus, apparently two species of Reptilians whose gender (female, male, neuter) was determined by the temperature at which their eggs were incubated. Originally, they were presented in a fairly straightforward Planet of Hats way- the Anjiri were matriarchal, with the females running the planet and the males being basically incompetent Space Pirates; the Nykkus were initially presented as a sort of Henchmen Race to the Anjiri. It later turned out that the Nykkus and Anjiri are actually one species with two forms; females of either "species" in fact lay eggs for both, apparently regardless of whether their mates are Nykkus or Anjiri. All the Nykkus shown in the original appearance were "Coldborn" (neuter and not very bright); the male and female Nykkus shown later have little interest in working for the Anjiri, although the females are a lot better disposed towards them. Oh, and incubation temperature also determines, or at least strongly influences, both intelligence and physical strength (with females being the strongest/smartest for each race).
  • The Phagors from the Helliconia trilogy have a cyclical libido, such that males are compelled to mate once every few days. They barely ever think about sex otherwise, yet the fact that such matings are conducted without any pretense of privacy, just as a human might sneeze in public, leads most humans to consider them lustful perverts.
  • The life cycle of the Tyr in The Madness Season proves important to the plot of the book. Their homeworld has a century-long highly elliptical orbit. At the closest approach, the Raayat-Tyr, which serve as drones, return to the homeworld and fight each other through the hive in an attempt to reach the queen. A Raayat who mates with the queen will be killed. But, if the Raayat kills her, he will transform into the new queen.
  • There is a lot of this is Piers Anthony's Cluster series; every species has a different, exotic way of breeding, and of course the hero, as he Body Surfs between the species, experiences them all.
  • The Rozes, troll/giant hybrids from the Garrett, P.I. series, claim to be "triplets with different mothers". Garrett has never been inclined to ask for details, so we don't know if it's this trope or a cultural thing.
  • Medea: Harlan's World was a collaboration between a number of major SF writers to create a single setting, and a series of short stories set on the titular moon. In Flare Time by Larry Niven, the reproductive cycle of the native sentients known as fuxes is described. They start off as six-legged females. At around seven they have their first litter, during which their rear body segment tears off, leaving them as four-legged females. The hindquarters contain the eggs, and function as a nest which the newborns eat their way out of. Around seventeen they have a second litter, leaving them as two-legged males, with the male organs exposed through the loss of the second body segment. The male guards the nest until the young are born, then goes into heat for about three years, and eventually ends up a 'post-male'.
  • Between their advanced knowledge of the universe, their shape-shifting nature and the wide-range of powers they are able to borrow from each other, the Gods and Demons of Divine Blood are capable of this even if it's not their normal choice. They are canonically capable of:
  • prot[sic] from the novel series K-PAX describes the K-PAXians' mating process as being extremely unpleasant, involving profound pain, nausea and a potent terrible smell. The books tie this in with a kind of Immortal Procreation Clause — since the K-PAXian lifespan is over a thousand years, combined with the unappealing mating process, there's no problem with either under OR overpopulation.
  • The Lo'ona Aeo in Mikhail Akhmanov's Arrivals from the Dark series have four sexes. Their approximate names are male, female, half-male, and half-female. Half-females are sterile and don't participate in the reproductive process. Males and half-males join their minds with females, which starts the "mental contamination" process and impregnates the female without actual physical contact. The resulting child's personality is based on all three parents. Until their maturity, Lo'ona Aeo can artificially induce a slightly different sex on themselves using medical means (e.g. an immature half-female can make herself a female). Reproduction is directed by the heads of extended families in order to prevent unwanted genetic branches. Thus, they may force a female to become a half-female in order to cut off any possible offspring from that line.
    • The novels describe a unique case of a human male (descended from a human-Faata hybrid) using his latent telepathic abilities to accidentally "mentally contaminate" a Lo'ona Aeo female. Her son ended up lacking the extreme xenophobia that all Lo'ona Aeo have and becomes an adventurer (a quality inherited from his father). Since Lo'ona Aeo live for over 1000 years, he has encountered several of his father's human descendants.
  • Little is known about the reproductive process of the Rosharan chasmfiend, but one stage seems to involve the creature climbing up onto a plateau, spinning a vaguely insect-like cocoon out of what is basically cement, and waiting for one of the storms that come along every few days. Presumably, they need the Mana the storms carry to fuel the transformation to the next stage of their cycle.
  • The Hosts in Embassytown have a cycle that's skimmed over, but there is an initial aquatic phase of life, where the young Hosts are referred to a "elvers", a terrestrial phase where young play and fight, middle age and sapience, and their final phase, lumbering and nonsentient. They evolved to reach that phase and wander mindlessly after younger Hosts who at the time would eat them, but modern civilized Hosts, with no need of that, abhor the idea and treat elders kindly until they drop.
  • The Color Of Distance's Tendu hatch in great numbers as tadpoles or narey. Eventually they metamorphize into froglike tinka, and live in the forests for a time until going into a village and acting as servants. Some tinka are chosen and treated to transform into bami, able to speak and reason and somewhere between children and apprentices. Bami, when those they were chosen by die or are exiled, are transformed again into sexually mature elders. Rarely elders will choose to become enkar, but this last stage is more a cultural than physical change. All levels eat some of the plentiful fertilized eggs and narey, and few tinka are chosen so that most die of animal attacks or old age, in order to help keep populations down.

    Live-Action TV 
  • Star Trek has plenty of examples, having been on TV for so long:
    • The Vulcans have "Pon farr", a mating season every seven years, where the male must mate or he'll die. Alternatively he can beat another male to death, which is just plain weird.
    • Xyrillian females can impregnate human males without the human noticing.
    • The Q can choose to have sex by touching fingertips, but being nigh-omnipotent that's not saying a whole lot we don't already know from the "omnipotent" label.
    • The Varro mate for life, and to ensure this they intermix their body chemistry, causing symptoms of physical withdrawal if a mate leaves.
    • All we know about Klingon sex is that it's not uncommon for both partners to break bones. Ow. A broken collarbone on the wedding night is a sign of good luck. Of course, given how Klingons tend to act, that might simply be a cultural tendency towards very rough sex.
    • The Taresians are born 90% female and claim to reproduce by implanting embryos in the wombs of females of other species, but the child will be fully Tersian. The truth is even weirder: They spread a retrovirus that turns males of other species into pseudo-Teresians, and then he's driven to return to the planet where they'll extract his DNA, fatally.
    • Female Ocampa go through "Elogium", a puberty-like stage where they can successfully conceive a child (in a growth on their back), but it only happens once. Also leads to a very large bit of Fridge Logic, every Ocampa female can only conceive once, and multiples births seem to be rare to non-existent... so if every female Ocampa can only produce one child in their entire life... how is the species not extinct already? The Fridge Logic factor of Ocampan reproduction goes far further than that: Despite only being able to reproduce once and only living for nine years, the females have constantly engorged breasts. The reason why humans have breasts and dogs don't is because we can reproduce whenever we feel like it - there is no biological reason why they should grow breasts a good four years before they can conceive. Secondly, they reproduce through a bizarre system of massaging feet and gluing their hands together for an entire week using a thick, sticky mucus - in the wild no creature could do this without being eaten by predators. This would logically mean both the males and females have nothing between their legs and are around about the same size - if this was real life and not being played by human actors and actresses the only way to determine a male from a female would be those anomalous breasts.
    • Denobulans have a mating season, and their breeding drive is regulated by powerful pheromones generated by their females. Males can become violent under these pheromones' influences. Culturally, they practice group marriage, and also remain promiscuous outside such formal relationships.
    • The Kobali resurrect, and genetically alter, the corpses of other species.
    • Andorians, as revealed in the expanded universe, have four separate genders, all of which are needed for reproduction. Deconstructed in that this is revealed to be causing their genetic diversity to break down; by the time period covered in Star Trek: Deep Space Nine Relaunch, they're a Dying Race with extinction predicted within fifteen generations. And that is being optimistic. There is actually a scientific movement underway looking to retro-engineer them back into being a two-gender race, which is meeting severe opposition from many Andorians, as the four-gender quartet is an integral part of their culture and religion.
  • Babylon 5's Centauri have six prehensile tentacles for sexual organs, which are flexible enough to (as Londo demonstrated in a first year episode) snake under a poker table and pick up a card on the other side of the table. Centauri women have six corresponding slits on their backs. What drives this into Bizarre Alien Reproduction rather than it simply being Exotic Equipment is that the amount of pleasure from intercourse goes up for each tentacle/slit used, and use of all six is required for conception. One imagines that Centauri orgies are as decadent as their civilization as a whole...
    • There's also the Pak'ma'ra, for whom the only reproductive information mentioned in-show is that the "hump" on their backs is actually their reproductive area. (According to Usenet postings by the creator, female Pak'ma'ra are tiny, non-sentient beings who live inside said hump.) Finally, in one episode Ivanova tricked one alien into believing that a strange dance (with nonsensical chanting)—which seem to be an abbreviated script for a one-night stand—and rubbing of hands was Bizarre Human Reproduction. At the end of the episode, Ivanova is left a gift by the alien: A trinket of some kind and a note saying "next time ... my way."
  • In Alien Nation, three Newcomers are required to make a baby: a male, a female, and a binnaum who catalyzes the impregnated female. Part way through the pregnancy, the female transfers the fetus to the male, where it slips inside his belly somehow and attaches an umbilicus to one of the male's nipples. It is the pregnant male who gets to have the wacky Born in an Elevator scene at the end.
  • In the original V miniseries, Willie recognizes Robin is pregnant because she's developing a ring of discoloration around her neck, which suggests that such rings are normal for Visitor mothers-to-be. His comments imply the ring becomes more complete as the pregnancy progresses.
  • The Greys in The X-Files are capable of incubating inside a human host that has been infected with Black Oil. When the hosts gets hot enough, the alien hatches into a long-clawed, violent creature that desires more heat. Eventually, it sheds its skin to become a "normal" grey alien.
  • The Vespiform can mate with a human thanks to phase-shifting capabilities. Thanks to phase-shifting capabilities.

    Oral Tradition 
  • The Greys are apparently extremely interested in human sexuality for some reason, so we are ourselves a case of Bizarre Alien Reproduction, inverting this trope among UFO nuts.

    Radio 
  • We're never told the details, but the Betelgeusians Ford Prefect and Zaphod Beeblebrox in The Hitch Hikers Guide To The Galaxy share three mothers (with the implication that Zaphod at least has more mothers who they don't share), which makes them "semi-cousins".
    • And Ford's father "both fathered and uncled" him, which could mean Ford is the product of incestuous relations, or just more of this trope.

    Tabletop Games 
  • Dungeons & Dragons includes multiple examples, mostly among the Aberration creature type.
    • Illithid Elder Brains (composed of the disembodied brains of dead illithids) asexually produce eggs in pools of water. The eggs hatch into tadpoles that cannibalize each other until the survivors reach maturity. Mature tadpoles are inserted into living adult humanoids to devour and replace the nervous system. This results in an adult illithid.
    • Beholders also asexually reproduce. After becoming pregnant, they gorge themselves until the fetuses become too large and pinch the esophagus shut. When the children come to term, the parent vomits up its entire uterus (which does not regenerate).
  • In Infernum, both the Legions of Hell and the spawn (Hell's equivalent of animals) have this.
    • Spawn reproduce by dying; when you kill a spawn, multiple smaller, weaker spawn of the same kind will emerge from the corpse within a minute or two. Kill those, and even more spawn that are even smaller will emerge, ad infinitum, until the resultant spawn is too weak to "divide" in this fashion any more and simply dies upon death.
    • Demons, meanwhile, reproduce through Spawning Pits... which manage to be even less fun than they sound like. Spawning Pits are filled with alchemical acids that dissolve living demons, but catalyse their organs, causing anywhere from one to thirty-six "larvae" to chew their way out of the decaying husk. After about six months, these maggot-like creatures pupate inside cocoons and then emerge as demons of the same kind as their "parent".
      • That said, some demons can reproduce sexually as well. The ability is most natural to Malcubi.
    • Making things even more bizarre: demons and spawn are related to each other. The first demons were born when fallen angels had sex with spawn.
  • Genestealers in Warhammer 40K avert this: genestealers are born in the normal fashion from humans who've been implanted, and each successive generation is more and more beastlike with apparent mutations like chitin and clawed arms until the fifth generation, which consists of purestrain genestealers, ugly, four-armed and look anything but human.

    Video Games 
  • The Galka in Final Fantasy XI are an all-male race. They reproduce by "reincarnation", whatever that means.
  • In Mass Effect, asari reproduction is based on 'melding'. During said process, the asari scrambles and changes up a DNA sample of her own, using the DNA of her partner, whatever sex and (sentient) species it may be, as a map/inspiration. The randomized version of the asari's genes is then combined with an unchanged sample of them for purposes of producing offspring. Physical contact is not required, but not uncommon. Even more weirdly, mating within their own species is discouraged in order to avoid certain extremely nasty genetic defects that can occur from such a union.
    • Much more disturbing with the Reapers, which melt down an entire sentient species into some sort of goo, which they mold into a new Reaper.
    • Salarian females lay eggs throughout their lives, several a year. Fertilized eggs hatch as females, unfertilized ones as males. In order to keep from overwhelming their worlds, salarians only fertilize 10% of their eggs, using extremely complicated reproductive contracts to arrange who does what.
  • In Patapon, you create new individuals by burying certain materials under a special tree.
  • In an old Maxis game, Unnatural Selection, genetically engineered creatures reproduce via "melting into a skin colored blob, combinating and laying a baby version of themselves" you can watch this here.
  • The tiny Pikmin apparently reproduce by bringing plant matter and insect corpses back to their hives/'onions', which spits out seeds that first plant themselves into the ground, mature for a while, and then get uprooted as new baby Pikmin. It is also possible that they require another creature (such as the player) to uproot them in order to enter their mobile phase and complete the cycle.
  • While it's All in the manual, Gears apparently lay eggs or the children come out in a protective cocoon they later hatch out of.
  • One of Atrus's journals from the Myst games describe an other-Agely creature called a "ting", which seals itself in a rock crevice, from which a bunch of lizard-like "solastings" emerge a couple of months later. It's unstated how the solastings give rise to the next generation of tings.
  • In Spore, Alien Animals dance together, then one of them lays an Easter egg (and then you can see if you have enough DNA stored up to tweak your critter for the next generation.)
  • Chao from the Sonic Adventure series reproduce when one Chao sits in a bed of flowers and it joined by another Chao, the two proceeding to nuzzle until an egg containing attributes from the two appears. Most Chao enter this mating phase naturally with time, though it's possible to force mating to occur by feeding them a certain fruit,
  • In Dwarf Fortress, it has been suggested that many of the species reproduce via spores rather than in the conventional fashion, given the way that you can chain up members of different sexes at opposite ends of the fortress and still get offspring.
    • A more deliberate design choice can be seen in the form of the Night Creatures who are single gender monsters who kidnap members of the opposite sex, transforms them into Night Creature Spouses and the procedes to reproduce in the normal way. The children are always the same sex as the Night Creature parent, and the spouse is often slain or simply abandoned (which inevitably means death at the hands of their former species). Notably, Night Creatures are happy to prey on elves, dwarves or humans, but goblins just don't do it for them.
  • In the X-Universe the Teladi lay eggs that always hatch females if left unfertilized. For this reason space Teladi are effectively a One-Gender Race.
  • Much like Xenomorphs, Chrysalids in X Com Enemy Unknown plant their seed into living hosts by viciously murdering them, which turns humans into shambling zombies. If a zombie is left alive for too long, it will burst into a newborn Chrysalid, identical in size to a "mature" one, but with lighter skin color.

    Web Comics 
  • Uryuoms from El Goonish Shive have this in spades. They have one sex (but identify as male or female, meaning they do have genders). It normally takes two individuals to make an egg, made by secreting a certain substance - it takes two only due to the amount needed. Once the egg (which looks like a meteor) is formed, it lacks any DNA of its own. DNA of anything can be put in (through the openings that make it look like a meteor), and it will naturally create a new viable chimeric being inside it. Any number of sources can be used, (the current record is twelve). There need not even be an Uryuom as one of the genetic parents!
    • Basically, they reproduce via a genetic engineer's wet dream.
  • In Homestuck, the Trolls reproduce by "mixing genetic material" with their lover and their archenemy in separate pails, and then giving the material to a drone. Gender is irrelevant to reproduction. All of the combined material is then basically mixed together, and a mother grub takes the best material and lays eggs for the whole species. As said in comic, Trolls sure are weird!
    • This has the side-effect of making pails (and pictures thereof) Not Safe for Work among trolls, as seen here. This lead to a meme among Homestuck fans in which they react to any depiction of a pail or a bucket as extremely lewd and sexual, which in turn also makes this video completely unintentionally hilarious.
    • Universes themselves have a bizarre means of reproduction, which involves Stable Time Loops, a video game which manipulates reality and draws the players into the game, a war between anthropomorphic chess pieces which one side is always destined to lose, and sped-up frog breeding.
    • Cherubs are even weirder than trolls. They can only mate with rivals, by a ritual where they typically go onto a black hole and turn into enormous, near-indestructable snakes that can only be harmed by one-another. Whoever loses the battle is impregnated with the young, and the Character Alignment of each child depends on which parent carries the young.
    • Leprechauns are possibly weirder than cherubs, although we've been spared the details. Their bizarre alien romance involves combinations of nine emotions, one of which equates to human love or troll matespritship, and most of which involve pranks and riddles Unlike the four "quadrants" of troll romance, any of these relationships could lead to reproduction, following a "mating jig". Oh, and they seem to be a Single Gender Race.
  • Sam Starfall from the comic Freefall is a Sqid. Only a small number of Sqid are fertile, and those breed early. Upon breeding, both the male and female die. A litter of young is born and, Sqids being scavengers, the Sqidlings have a ready-made food source. Other adults come along and pick Sqidlings to raise (a process described as being like picking a puppy). These "Mentors" raise the young Sqid in their race's ideals of chicanery and stealing everything not nailed down or on fire.
  • The title character of Schlock Mercenary is a carbosilicate amorph, essentially a race of organic data-storage systems turned sentient. They typically reproduce by splitting off a part of themselves that contains their personality, and merging it with that of another. On top of that, due to the "sentient data-storage" bit, it's also possible to reproduce with non-amorphs through a period of observation - a process Commander Kevyn compared to marriage. On top of that, two amorphs battling it out usually results in, rather than one or both parties dying, a single amorph with merged personality traits of both combatants.
    • Also in this 'verse are the Qlavo, who conceive normally with males and females, but hand off responsibilities of development to a third gender, muftales.
  • Allow Volaster Jarvoc explain to you how demons of Asgard reproduce in Heart Core:
    "...a demon never truly dies...but they never truly reproduce either. It's rare, but when a demon decides to renounce their life, an egg with their reincarnation appears...This egg will also have attributes from another demon they've been in contact with. Within two years' time, the new demon will require the originator's Heartcore, effectively relieving them of duty."
  • In Outsider the Umiak didn't use to apply for this. But nowadays they've biologically modified and twisted themselves so much that they might not even have any sort of natural reproduction cycle. Almost every Umiak seen is a clone of some sort.

    Web Original 
  • It's not what the exact process of reproduction is for aliens in Red vs. Blue, but in the end, somebody's going to get infected with an alien parasite and give birth. Even if they're male. And the alien in question is male too. It's like a miracle to see nature at work!
  • The speculative alien species Triaformica has three sexes, but only needs two, each of a different sex, to reproduce. Sexual organ-wise, they're all hermaphrodites and the organs are in their chests, accessable via a normally airtight hole into which they stick their own tongue during mating to get their own set of sex cells. Then they stick their tongue into the hole of their partner while said partner is in heat to drop the cells into. The whole process takes about a minute and, while it feels 'nice' to them, it certainly isn't as pleasurable in the same way as humans.

    Western Animation 
  • Kiff from Futurama gets pregnant by touching someone.
    • Kif's species (Amphibiosans) become receptive to DNA transfer (impregnation) when they develop a strong emotional bond with someone, their smizmar. DNA is transferred through touch, and presumably any species' DNA is compatible. While in the episode in question the biological parentage gets mixed up, the smizmar is the "true" parent.
    • Dr. Zoidberg's species lay eggs into the ocean and then die off en masse. He's only lived so long because no female seeking a mate will even look at him. This doesn't prevent Zoidberg having a Jewish Mother-equivalent relative, so presumably some Decapodians avoid mating to raise the kids.
    • Futurama plays with this trope a bit by having aliens be unaware of human reproduction. Human noses are harvested as an aphrodisiac under the incorrect assumption that the "human horn" is the main reproductive organ. Lrrr is surprised to discover that humans have a "lower horn" hidden in their pants.
  • There was an episode of the 90s X-Men cartoon where Rogue was almost turned into a Queen for the Brood, an alien race which breed by basically infecting other species and turning them into one of themselves. However, Rogue touched Wolverine, borrowing his Healing Factor and returned to normal.
  • The French/Chzech cartoon Fantastic Planet features the Draags. When the Draags wish to reproduce, they go into a meditative trance, which causes a spherical forcefield bubble to form around them as they float up into the sky toward their planet's moon. Upon reaching the moon, they land on gigantic, headless Greco-Roman statues, which proceed to dance the waltz (no, really, that's all they do).
    • In all fairness, that could have just been foreplay - the Oms (humans) did sort of start destroying the statues mid-dance.

     Real Life 
  • Many of the above scenarios were based on the life cycles of Real Life organisms.
  • Ichneumon wasps implant eggs in host species, typically caterpillars. Hosts are also infected with a polydnavirus that suppresses their immune systems to protect the eggs. The larvae consume the least essential portions of the host's anatomy first, keeping it alive as long as possible. Once the larvae are mature, they emerge from the still living host and weave cocoons. Certain species produce mind-altering chemicals that causes the host caterpillar to guard and protect the cocoons until they hatch.
  • Eusocial insects have a reproductive caste.
    • In honeybees, sex is usually determined by males being haploid (one set of chromosomes) and females being diploid (two sets of chromosomes, like humans). Female larvae fed royal jelly become the reproductive "queen" caste.
    • In termites, all castes are split between male and female but, depending on the needs of the hive, can change caste. If any of the queens or kings in a colony dies, another will change to take their place.
  • Microorganisms physically merge when mating, in a process called bacterial conjugation.
  • Plants alternate generations. In the case of flowering plants, the equivalent would be a human becoming pregnant, then having sex which fertilizes their fetus, and then the fetus gives birth to the offspring.
    • A similar process can be seen in aphids, which alternate generations between parthenogenic females and sexual reproduction.
  • Internal parasites, such as liver flukes, make all the above examples seem routine.
  • The male anglerfish is tiny compared to the female. The sole purpose of the male in life is that once it gets the scent of a female, it swims to it and bites down on the side of the female. At the same time it excretes an enzyme at the mouth which causes it to physically fuse to the side of the female, and is functionally reduced to a pair of balls hanging from the side which the female can use to impregnate itself when it is most convenient. When anglerfish were first studied, the males were thought to be a completely different parasitic species.


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