EXTRATTERSTRIAL TEEN

BONELESS

The Boneless are beings from a  two-dimensional universe. They shortlt managed to invade our tridimensional worlds in 2014 in Bristol, UK. They are able to reduce both lifeforms and other three-dimensional objects to two-dimensions and back to a rough tridimension afterward, with the ability to possess them.
Source: Doctor Who, episode Flatline, 2014.

MOON / MOON CREATURE

The moon creature is a giant living creature which had been developping inside its egg, Earth's moon, for possibly as long as 4 billions of years. It hatched in 2049 after an intense one year growth period during which it increased its mass dramatically, breaking the Moon's crust in the process.

At birth, it weighted 1,3 billions tons, most of it being the egg it itself was ready to lay as soon as it was being born, and which was to become Earth's new moon, along with the dust left by the disintegration of the former moon's crust.

The creature itself is composed of a short somewhat moth-like body with long flayed tail and of two pairs of diaphan wings that composed most of its mass. After laying its egg, it flew away toward deep space.

Its whereabouts afterward remain unknown, as do its origins: was the egg initially layed by another creature or did it evolve on spot, possibly as a result of the planetoid Theia with the Earth. This also raises the question of a possible panspermia originating from Theia. But this hypothesis is highly speculative.

Source: Doctor Who universe, 2014, Kill the Moon, written by Peter Harness.

Here are two 3D echography of the Moon dating hours prior to its hatching.

TELLERS

The Teller are large muscular sentient humanoids gifted with powerful telepathic powers. They have grey elephant-like skin and elephant-like feet, a vaguely snail-like head with articulated eye stalks on each side of it, a short ribbed tail and two long claws serving as hands. Their nostrils are presumably situated under in series, along their eye stalks. One of their main defense mechanism consist of emissions of psywaves that can liquify the brain of their victims, indicently causing the skull to cave in.

They probably developed a primitive culture on thier howeworld but were all exterminated after being discovered by offworlders, presumably humans, at some point in the future. Two were kept alive to serve as guilt detectors for a galactic bank until the bank was closed and they were relocated to an uninhabited world.

Source: Doctor Who universe, Time Heist TV episode.

POD PEOPLE / BODY SNATCHERS

The Pod People are a nomadic alien species of small gelatinous creatures originating from a dying planet. They evolved the ability to defy gravity and left their planet in search of a new world to settle on to float in space for millenia before occasionnally landing on suitable worlds. The Pods' sole purpose in life was that of individual survival, with no attention given to the civilizations they conquered or the resources they squandered. They would then consume all of the planet's resources, only to then leave in search of yet another new world. It is hinted that such a consumption was the fate of the civilizations that once inhabited Mars and the Moon. 

Upon landing on a planet, they would try to replace the dominant species by  growing into large plant form which would spawn emotionless replicas from its pods; As a pod reaches full development, it assimilates the physical characteristics, memories, and personalities of any sleeping person placed near it; these duplicates are devoid of all human emotion. The assmiliation process would leave the original bodies to disintegrate into dust once the duplication process was completed. The duplicates had lifespans of only five years, and could not sexually reproduce.

Earth was among the planets the landed on. Stories of case where such cases happened

In 1956, they landed in a small California town. Alien plant spores grow into large seed pods, each one capable of reproducing internally a duplicate replacement copy of each human. A local doctor uncovers what is occurring and managed to stop the invasion with the help of the Federal Authorities.

In the 1978 invasion, the pod landed in San Francisco and managed to bring their effort further. The replicas showed the ability to communicate thru scream in a creepy alien voice to alert other pod people of those not yet taken and seemed to exhibit a kind of extra-sensory perception. Replicas merging more than one subject were also witnessed like a case of a merged man and his dog.

As similar scenario happened in 1993 in an Alabama Amry base.

In 2007, the invaders changed their method, from pods, they made contact with humans directly through liquids and then worked much like viruses which,  once the person had fallen asleep,  rewrote human DNA. The aliens then vomited a gelatinous substance into liquids to help the invasion continue. When the invasion gains considerable strength, the pod people transform humans by directly injecting them with the substance, under the guise of "influenza vaccines".  However, it was discovered that people who had certain illnesses during childhood were completely immune to the virus. A vaccine was created and the entire pandemic is cured within a year; those infected, after being treated,we re unable to remember events during their infection, "as though they were in a deep sleep".  In one California town, though, the invaders used their traditional method, but with more egg-like pods.

Source: Jack Finney's  novel The Body Snatchers. (1954);

Invasion of the Body Snatchers (1956 film); Invasion of the Body Snatchers (1978 film); Body Snatchers (1993 film); The Invasion (2007); The invasion of the Pod People (2007)

 

SONTARANS

Planet of origin: Tthe moon of planet Sontar (AKA Sontara), a planet with 5 times Earth's gravity, in the Milky Way Galaxy.

Several thousand years ago, at a time when the Kaveetch people, a humanoid species native to Sontar which had developed an advanced space faring civilisation, were losing a war against the Rutan Host and coming close to extinction, they established on the moon of their homeworld an infrastructure allowing them to mass produce clones genetically engineered to excel in the art of war. The belligerent and militaristic Sontaran clones managed to fight off the Rutan assaults and got rid of the remaining Kaveetch they deemed inferior to themselves. The existence of their creators was eventually erased from their history. Their revised origin presentedand rewritten as them as a species split into clans, which fought amongst themselves until the arrival of a common foe, the Rutans, forced them into unity.

The Sontarans are grey-brown skinned greenblooded  humanoids. They have have large potato-like neckless heads, three fingered hands and short stocky bodies. Due to the high gravity of the moon of Sontar where they were first created, they have great strength and resilience in lower gravity environments. Although extremely resistant, they are vulnerable to coronic acid. They absorb energy via the probic vent on the back of their necks. A sudden blow to the vent would stun them while the penetration of a sharp object into it will kill them. Tampering with the energy feed could also lead to a reversal effect that could destroy them from the inside out.

The Sontarans are capable of creating around a million clones every four minutes, grown in vats and were nourished by sezerfine gas, and are therefore able to sustain massive casualties.  They can also heal their wounds with a stubby tubular device called a tissue rectifier.

The Sontaran technology has allowed them to miniaturised FTL technology to a point where small one men craft have interstellar range. Whatever their size, their starships are usually spherical. They use teleportation technology using generators situated at area of materialisation and dematerialisation, and limited time travel technology which they inherited from the Kaveetch. By the 13th centuray, they used osmic projection. In the 20th century, they started making attempts to obtain more effective time travel

Sontarans also used mind control individuals, either taking over their minds through rheon carbine, a thin, metallic weapon, which was designed to optimally fit the Sontaran hand, and was used for energy projection and hyponotism; or controlling them with devices attached to the neck.

Sontarans used a Base-6 counting system.

They are known to have visited Earth during the ancient Egyptian civilisation, where he was worshipped as a god until the humans learned that he planned to destroy Earth, at whihc point he was buried alive in a pyramid.  

In the 13th century, a scout, landed in England and claimed it for the Sontaran Empire. He proceeded to make an alliance a local warlord, and to transport scientists from the late 20th century into the past using his osmic projection. He would then hypnotise them in order to make them work on his ship.

From that point on, several sontaran scoutships eithet landed or crashed on Earth, most of the time with fatal results, like the one that crashed in  Tunguska in the 1920ies. But it is not until 2009 that an all out invasion of the planet was attempted. As the Sontarans were momentarily losing their eternal war against the Rutans,  the Tenth Sontaran Battle Fleet made plans to convert Earth into a cloning world but failed, resulting in the destruction of their fleet.

Source: Doctor Who universe.  (TV: The Two Doctors, TV: The Last Sontaran;  The Time Warrior, The Sontaran Experiment, The Sontaran Stratagem / The Poison Sky)

BA'NETH

Planet of origin: Unknown, in the opposite quadrant to Earht in the Milky Way galaxy.

The Ba'neth are a non-humanoid sentient species which has developed an extremely xenophobic and reclusive space faring civilisation as of the 22rd century. They possess 3 sets of tentacles on the side of their boyd, whihc can be used for either locomotion or prehension, along with another one at the back of their "neck", which is normally used over their head, and another one at the base of their body, whihc serves as a tail and to help stabilise them in a standing position.

Source: Star Trek Universe, Voyager, Riddles.

FLYING SAUCERS ALIENS

The Flying Saucers Aliens are a humanoid species looking much like a frailer version of humans which developped an advanced technnological civilisation and achieved interestellar space travel technology. They had to flee their home planet and entire star system was destroyed when their sun went cold centuries ago. Claiming to be that those inside the saucer fleet orbiting the Earth  are the last of their species, they tried to invade Earth in the late fifties after some a dozen of artificial satellites had been put into orbit by Project Skyhook. After launching an attack on Washington, Paris, London and Moscow, they were destroyed by a weapon that could negate their saucers' magnetic propulsion system.

Source: Earth versus the Flying Saucers, 1956, Directed by Fred F. Sears, from a screenplay by Curt Siodmak, George Worthing Yates and Bernard Gordon, supposedly based on the non-fiction book Flaying Saucers from Outer Space by major Donald E. Keyhoe

 

BOBODIX

Planet of Origin: Lonsee-23

The Bobodix are a sentient species which  are each the size of Antarctica. They are known to use thermonuclear devices to caramelise their food, the snadge puddings.

Source: Doctor Who universe  (PROSE: Come Friendly Bombs...)

Note: Only mentionned by the Third doctor but never actually seen in a story.

BALUMIN

Planet of origin: Balumin

The Balumin are a sentient species which has developed an advanced space-faring civilisation as of the 40th century. As of the 347th century, they are believed to still be around and have access to time travel. They are egg-shaped with tentacle-like arms and either blue or orange skin, large eyes. They are known to smell of oranges and lemons. 

Source: Doctor Who universe (PROSE: The Slitheen Excursion, (PROSE: The Pirate Loop)

IXODES / CRAWLING EYE / TROLLENBERG TERROR

The Ixodes are a sentient non-humanoid which developed a space faring civilisation who look like a several meters wide fleshy balls cover with bulging veins with a giant eye located frontally on their equator and several powerful tentacles about twice as long as their body which they use both for prehension and locomotion. They generally move about surrounded by a cloud that provides them the subzero temperatures they need to survive.

They are known to have settled camps on some of Earth's mountain tops in the 1950ies for reasons unknown but following aggresive behaviours, were either destroyed or chased away. The means they use to travel through space remains unknown.

Source: The Trollenberg Terror serial (1956),  and the film The Crawling Eye (1958) (Both directed by Quentin Lawrence, with the screenplay of the serial and its story by Peter Key, while the screenplay or the movie was from Jimmy Sangster)

PAIRANS

Planet of Origin: Paira, a planet on the same orbit as Earth but on the opposite side of the sun

The pairans are a pacific sentient non-humanoid species which developed an advanced civilisation capable of interplanetary space travel millenia ago and have been watching Earth for 4000 years. They look like 2 meters tall starfishes standing up on their 2 bottom legs and using their 2 middle legs for manipulation. A giant eye at the center of their body serves as their main sensory organ.

Pairan technology allows them to transmutate into another lifeform, a technique they used with humanity when they made contact with selected humans in 1956 to warn mankind of the danger of Planet R, a comet on collision course with our own as well as of the nulcear research, mainly the development of Urium 101, a substance much more powerful than regualr radioactive elements.The comet was finally destroyed thanks to the use of Urium 101 and the Pairans returned to their homeworld.

Source: Warning from Space or Mysterious Satellite (宇宙人東京に現わる Uchūjin Tokyo ni arawaru^?, Spacemen Appear in Tokyo, Diaie, 1956. Director: Koji Shima, Writers: Gentaro Nakajima (novel), Hideo Oguni (screenplay). Jay Cipes and Edward Palmer (english dialogues)

JOTOKI

 Art by Souhjiro, copyright © 2009

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Jotoki are non-humanoid sentient communal organisms that developed a space faring civilisation.
The Jotoki resemble large, spindly starfish. They are born as small aquatic swimmers, most of which are eaten by predators; in time, survivors will merge in groups of five to form one collective organism, which grows into an arboreal creature; its tails become arms, and its fins differentiate into fingers. When it grows large enough, the Jotok imprints itself on an adult and enters a stage of rapid learning and brain growth. A Jotok who desires a family can simply go into the wilderness and "harvest" an adolescent. Unimprinted adult Jotoki are considered feral, and regarded as little more than animals. Since the five subunits that make up one Jotok individual are not necessarily genetically related, reproduction does not require sex; a Jotok can simply find a pond and deposit its offspring to begin the cycle again.
The Jotoki were experts at trade. Their interstellar trade empire was quite developed for its time, but when the Jotoki attempted to use the Kzin as mercenaries, the Kzin revolted and conquered the Jotoki. Before their enslavement, Jotoki operated in groups called "clanpods", as part of their former planet-wide tradeweb. Details of this arrangement are not known. Jotok technological specialties included gravity polarizers, linguistics and biotechnology. They had the ability to force-grow clones to adulthood. The Kzinti believe that there is a free Jotoki fleet wandering amongst the stars, which would have provided their most strenuous opposition.
After the Man-Kzin Wars, humans recovered some Jotoki swimmers in an attempt to breed a free Jotok species.
Source: Larry Niven, Known Space Universe, (informations adapted from the Wikipedia entry), "The Asteroid Queen", by Jerry Pournelle and S.M. Stirling, "In The Hall of the Mountain King", by Jerry Pournelle and S.M. Stirling, "The Heroic Myth of Lieutenant Nora Argamentine", by Donald Kingsbury

NIMONS / MINOTAURS

The Minotaurs are a minotaur-like humanoid species that developed a parasitic spacefaring civilisation on an interstellar scale. Parasitic by nature,  they fed on the faith of other life forms and survived by descending on primitive planets, setting themselves up as gods to feed on the worship of the natives. They could not feed on a person who held no strong beliefs. After a while when species became advanced, they usually managed to expell them upon realising their true nature.
A more dangerous offshoot of the species, called Nimon, could effectively drain not only faith but the very life force of their victim and could shoot blasts of energy from their horns. The Nimons were able to consume to extinction the population of an entire world within a few years. As their food source got scarce, they would look for another planet ripe for conquest and draining. A scout would descend on a planet, representing itself as a god with gifts of  advanced technology and start to construct a maze-like Power Complex  designed to generate a portal back to the Nimons' current planet. The Nimons would then migrate en masse to the new planet using capsules sent through the portal,  drain that world dry and look for the next, continuing the cycle they referred to as the Great Journey of Life.
They are said to have been one of many races that participated in the Millennial War some 150 million years ago against the Mad Mind of Bophemeral where they collaborated with the Osirians in dropping quantum collapsers on the insane computer intelligence. (PDA: The Quantum Archangel). At some point after the third millenium, after having drained the planet Crinoth, all traces of them was lost while they were travelling via their their portal toward their next prey, the planet Skonnos.
Source: Doctor Who universe,    (DW: The Horns of Nimon)  (DW: The God Complex)

DOUWD

The Douwd are a peaceful immortal extragalactic uncorporeal species, self-described as "beings of disguises and false surroundings". Through their uncanny psychic powers, they have the ability to create and destroy on an interstellar scale and maybe more. Although they can't bring people back to life, they can make illusionary recreations of them. Although seamingly nearly omnipotent, they are not omniscient.

One Douwd has been known to travel the Milky Way,sometimes under the form of a human in the course of the 24th century. During that time, he destroyesd the Husnock civilisation after they had wiped out a human colony on which he was living.

Source: Star Trek universe, (TNG: "The Survivors")

GOLDILOCKS ALIENS / BATTLESHIP ALIENS

Planet of Origin:Goldilocks planet, in the Milky Way galaxy

The Battleship aliens are a sentient species that developed an advanced civilisation with space faring capacity.

The are vaguely humanoid. Their hands have four opposable finger and their feet have clawed tows. They sport both mammal and reptilian features, Their face is vageuly humanlike but with less pronounced features, They are blad but possess a set of spikes all over their chin that looks that is reminiscent of a goatee beard. They are sensitive to bright lights and dislike daylight such as we have on Earth.

A scouting party came to Earth in 2012 in response to a signal from mankind had been received on their homeworld. Their goal was to establish if the planet was worth settlement. This invasion force which landed near Hawai was disposed off by the humans.

Source: Battleship movie

PRECURSORS

The Precursors are a non humanoid sentient species that developed an advanced spacefaring civilisation. Their civilization was based around the Mantle, a belief hat it was their role to protect all life in the galaxy. They presumably monitored the evolution of other sentient species throughout the galaxy, intervening in ways that ensured their civilizations would follow paths of peace, free of conflict. They were chased and destroyed by one of those younger species, the forerunners, in a war that took place some 150 000 years ago, presumably upon learning that they had chosen the humans as heirs to the Mantle instead of them. The Precursors unleashed the Flood to avenge this act of agression.

Precursors are believed to be"very large", with 4 upper limbs and 2 legs. Also having an "ugly head shaped like arthropods" - like spiders or crabs or scorpions - they have oval, faceted slanted eyes and a "flat face". Coming from the back of the head is a long tail with a 2 meter barb coming out of it but no visual record of individuals of the species exist as of now.

Source: Halo Universe,

ENGINEERS / SPACE JOCKEYS / OSSIANS / PILOTS / MALA'KAK / GARDENERS / COLLECTORS

The Engineers are a sentient species which developed an advanced space faring civilisation, became expert in bioengineering. They look like two meters tall white skinned overmuscled bald humans with dark eyes. Their DNA matches that of Earth's humans.

They are believed to have seeded other worlds and influenced the development of other lifeforms.

They are believed ot have come to Earth at some point in the distant past, as some cave paintings and carvings clearly state by showing the position of what is believed to be either their homeworld or their nearest outspost thru primitive starmaps. It is to be noted that those starmap represent the same stars configuration as the ones found on the starmap drawn by Betty Hill under hypnosis after having been supposedly abducted by aliens from Zet Reticuli.
Some conjecture that they may have either:
A) created mankind or influenced its development by spreading their DNA in Earth's water with the help of a mutagen agent of their making
B) been responsible, by the same means, of bringing life to Earth.
The seeding of Earth, whenever it took place and whatever its effects were, was done through a ritual suicide of an Engineer ingesting a grey goo, a mutagen compound which dissociated its cellular structure in a matter of seconds. Its remnants then flowed in Earth's running water. Theories suggest that this took place at Victoria's waterfalls in Africa.
Other theories say that they sent an emissary to Earth 2000 years ago to ensure that humanity was on right path and that he was crucified. They then decided to wipe out the human species as it was deemed dangerous.
Other theories, taking the Barney and Betty Hill abduction as evidence, reject that the Engineers wanted to wipe out humanity as they seem ot have visited the place with purely scientific purposes in the late 20th century.
The Engineers are known to have possessed a research facility dedicated to bioengineering and bioweaponry on  the planet known to humans as LV-223 (as indicated on primitve starmaps found on Earth), one of three moons of a ringed gas giant, orbiting the star Gleise 86, some 35 light years aways from Earth. It is believed that, they had plans were made to wipe out all life on Earth and start anew by bombing the planet with grey goo containers 2000 years ago. The project was put to a stop when something went wrong with their creation and the whole colony was wiped out. Another Engineer ship is known to have crashed on Acheron (LV-426) the second of three natural satellites that orbit the gas giant Calpamos,  the fifth planet from the star Zeta 2 Reticuli, some 37 light years away from Earth. If this ship came from LV-223, while most likely, remains unknown. Rather than transporting grey goo pods in its cargo bay, it was transporting Xenomorph eggs. Wether those eggs had been placed there by Engineers of Xenomorphs remains subject to debate.

Source: Prometheus movie, Alien / Predator Universe , Xenopedia Entry

Note 1: It is interesting to note that the Ancient Humanoids presented in the Star Trek Universe had a similar seeding program. For the little that was seen of them, they also shared some ressemblance with the Engineers. The beings are said to be  presumably the first humanoid species to evolve in the Milky Way galaxy, some four and a half billion years before the common era. Their true name lost since time immemorial, they have also come to be known as the Ancient Progenitors, and the Galenites, a name derived from the man whose work led to their discovery, Dr. Richard Galen. (TNG: "The Chase", Star Trek: Dark Horizon, Star Trek: Pendragon) During the height of their existence, they explored the galaxy, but found no lifeforms like themselves. Realizing that their species would one day cease to be, they seeded many primordial planets with the building blocks of life, encoding the DNA so that it would evolve into forms similar to their own. Earth was one such planet.
Note 2: It is also interesting to note that in the film Mission to Mars, the  martians are revealed to have seeded Earth with thesame results - while the method is not show - before they were to depart the solar system to populate other worlds at the time Mars was to be hit by a giant asteroid, as shown here. For waht was seen of them, the martians were humanoid but apart from that, did not look that much like humans or engineers.

ABYSS BEINGS / N.T.I. BEINGS

The Abyss beings is a peaceful sentient species which developed a space faring civilisation a long time ago and estblished undersea colonies on several worlds.
While vaguely humanoid, its shape is reminiscent of the Manta Ray  and the medusa.  Its overall shape is mostly that of a ray under which a humanoid torso would have been attached. It uses its fin wings for locomotion. while manipulation is managed by the two arms with three fingers on each hand whihc are attached to its slender humanoid torso. Its  head with eyes and eyelids, but no other discernible features. It does not appear to have any bones, but a see through cartilaginous skeleton. They are translucent, and capable of producing neurally controlled bioluminescent light within their bodies thru chemical reactions and use it to communicate among themselves.
They uses gigantic craft for interplanetary travel and sink them when finding a suitable planet on which they use them as settlements .
They have developed liquid  manipulation  at the molecular level. They can plasticise it, polymerise it, and put it under intelligent control to different purposes, wether it as a communication channel or engineering purposes such as mimicking solid objects, making giant prehensile water tentacles,  creating massive tidal waves  or parting water to leave aquatic predators stranded in dry air.
The Abyss beings had a settlement on Earht for thousands of years but left the planet toward the end of the 2nd millenium.
Source: The Abyss