KRILLITANES

The Krillitanes are a metamorphic carnivorous species with very sensitive earing that can take physical features from other species. Circa 1100 BC, they looked like humanoids with long necks and hooked tails. After having invaded planet Bessan, they started to growbatlike wings like Bessans. Some came to Earth around this time. A small group was also present around 2007.

Source: Doctor Who Universe: School Reunion, NSA: The Krillitane Storm

THE SILENCE

The Silence are humanoids ressembling grey aliens. They stand nearly 2 meters tall with bulbous heads and grey, mouthless faces. Their hands possessed large, elongated fingers with a bulbous central finger. They speak in low, guttural voices and tended to make growling or clicking noises. Their bodies are covered with what appears to be black suites. As soon as someone is not looking at a Silence, its memories of it blanks out of his memory but remains in his unconscious as upon looking on a Slience again, previous memories of meetings come bac (also to blank out as soon as visual contact is lost). They absorb energy from nearby energy sources and discharge it from their hands with enough power to disintegrate a human. When absorbing the energy and discharging it, a hole appeared where a mouth should have been. They can influence humans by saying something while a person was looking at them, which would remain in there heads after they looked away in a form of post-hypnotic surgesion. Constantly doing this would cause the person in question to lose their mind.
The Silence were apparently present on Earth for hundreds of years since the time the wheel and fire were developed, going unnoticed by the human race. The Silence were defeated by the Doctor when he ensured humanity saw footage of a Silent ordering people to kill them on sight, broadcasted via the moon landing. This 'command' acted like a post-hypnotic suggestion and resulted in the human race finally turning on the Silence.
Source:Doctor WHo Universe : The Impossible Astronaut, Day of the Moon

SKYLINE ALIENS

The aliens travel through space, visiting planets on which they project sort of blue energy that connect them all as lure which mesmerizes indigenous lifeforms. The victims are then harvested before their central nervous system is extracted to be used, it seems, as power source. The aliens are divided in several specialised subspecies, some of which have been witnessed.

The largest known entity is the Mother Ships which comes in all shapes and size but is usually several hundred meters long and able to travel interstellar distances, transporting the smaller specimens of the species. They seem to be moving in pack from worlds to worlds.

The Tankers are anthropomorph entities 20 to 30 meters tall. They are used as cleanup crew, gathering the indigenous specimens that have escaped being lured by the blue light.

The Hydras are the big flying squid creatures.

The drones are smaller octopus creature, which are able to enter tighter spaces.

There seems to also be smaller anthropomorph aliens which stays inside the mothersip and most likely others which have not been witnessed yet.

Source: Skyline

NESTENE

Planet of Origin: Polymos, a world far from a red star with very little tectonic activity.
The Nestene Consciousness is a telepathic gestalt entity of pure psychic energy, somewhat amorphous or cephalopod-like in appearance. It developed on the planet Polymos, which it completely infused, destroying all other life on it.
It has the ability to transport sections of its mind through radio waves and possess plastic, shunting some of its consciousness into it or create a body out of it, allowing it to manipulate its surroundings.
Consciousness bits travel through space in hollow spheres known as energy units. These units make planetfall in formation, appearing like normal meteorites . Once the consiousness within those spheres is recombined and placed in an environment tank the Nestene will take on a form that it believes to be perfectly adapted to the planet on which it has landed.
Usually, the first spheres to arrive will attempt to place a local being under some form of mental control to regroup all the units together and fashion plastic automatons known as Autons, which may include replicas of key authority figures as well as simpler automatons. The Nestene will then use the Autons as an army to conquer the planet.
Source: Doctor Who Universe.

ARNOR / DREAD LORDS

Planet of Origin: Amalda in the Amaldia system
The Arnor were a powerful civilization that existed millions of years ago and which got politically divided in two factions, one calling themselves Arnor, the other one, Dread Lords. As the Dread Lords were on the brink of conquering the galaxy, the Arnor , on the brink of extinction, sealed them away into a pocket universe. It remains unknown what happened to them afterward.
Source: Galactic Civilizations

ALTARIANS / DRATH

Planet of Origin: Altaria, a planet orbiting Altaris. Relocated to Dratha in the Drathis system after a war with the altarians.
The Drath Legion is a reptilian civilization that was nearly wiped out by their homeworld's other more numerous sentient species, the Altarians during a dominance war and who consider themselves the true Altarians. The Drath are passive-aggressive manipulators, remaining hidden and pulling the strings on the weak and powerful alike with subtlety in mind and seemingly infinite patience.
Source: Galactic Civilizations

APLANS

Planet of origin: Alfava Metraxis, the seventh planet orbiting Dundra, in the Gan belt.
The Aplans are a peaceful bicephal humanoid species. Each heads has its own intelligence and personalities. They are prolific builders, and erected notable landmarks including the Aplan Mortaria, sometimes known as Mazes of the Dead, large subterranean labyrinths with tombs in the walls, adorned with statues of the dead. The Mazes hassix levels, representing the ascent of the soul in the Aplan religion. The Aplans adept at recording their social, cultural and political history.
In the 47th century, a large population of Weeping Angels came to Alfava Metraxis and hunted the Aplans to extinction, the Angel colony lacked any further energy source and over the centuries, the being energy deprived began to degrade and went into hibernation. After the Angels fell into a Crack in Time in the 51th century, they stopped existing, which means the Aplans could still be existing.
In the 49th century, the planet was terraformed by human settlers. As a result, the atmosphere boasted a high level of oxygen and a low amounts of toxins. It had an oxygen-rich atmosphere, and an eleven-hour day. During the 49th century, humans terraformed the planet and by the 51st century, six billion settlers had come to live there.
Source: Doctor Who universe, (DW: The Time of Angels)

SATURNYNIANS

Planet of Origin: Saturnyne, an earth-type planet with huge bodies of water.
The Saturnynians are amphibians with fish and crustacean traits, They have a vaguely humanoid upper body, a fishlike head with sharp teeth and lobster-like lower body. They have a strong sensitivity to ultraviolet light, being repelled by smaller amounts and being incinerated by large amounts.
They are capable of converting some other species (like Humans) into Saturnynians by draining them of their blood and replacing it with their blood.
Some time in the species' history their home-world was besieged by the cracks in the universe, ranging from small cracks to cracks that consume the planet's sky. At first the cracks appeared to pose no real danger and the aliens were able to observe other worlds through some of them. Eventually, however, the true nature of the cracks became apparent and Saturnyne was lost. Some took their chances with the cracks that showed other worlds and fled to worlds with oceans like their own planet. One colony made it to Venice in 1580 but was only able to survive on Earth for a short while.
Source: Doctor Who universe (DW: The Vampires of Venice)

PIPE PERSONS / PIPE PEOPLE

Planet of Origin: Terra Alpha (human designation), am Earth size planet with a yellow-purplish atmosphere.

The Pipe People are 4 feet tall humanoids which developed a preindustrial civilisation. They were forced to live underground when humans colonised their planet. They assisted the human working class in a rebellion against the colonial regime which led to a subsequent peaceful cohabitation.
Source: Doctor Who Universe, (DW: The Happiness Patrol)

STAR WHALE

The Star Whales are ancient giant peaceful spacebound sentient creatures. They had several flippers and tentacle like protrusions on their backs and are capable of surviving in the vacuum of space. According to legend, they guided early space travellers through dangers on their journeys through space. By the 29th century, the species is believed extinct save for one, who is theorised to be the last of its kind.
Source: Doctor Who Universe, DW: The Beast Below

MULTI-FORM SPECIES

The multi-form species is a sentient lifeform naturally gelatinous, appearing as a snakelike mass of glowing tendrils with a mouth full of sharp teeth. Capable of creating a perception filter to stop itself being seen, or to hide anything it wants to hide, it is highly polymorph. Having created a psychic link to a living but dormant creature, it can then copy the appearance of that creature or of anything they dream about. Coma patients provide the perfect live feed. They can live for millenia.

One specimen of the species, Prisonner Zero, a known galactic criminal, was locked up in an interdimensionnal prison on Earth by the Atrax for years until 2010.

Source: Doctor Who Universe, DW: The Eleventh Hour

ATRAXI

The Atraxi are a galactic police force.
Working in groups, they resemble eyeballs four meters in diameter around which orbits a ring-like crystalline snowflake structure.
They are capable of atmosheric as well as of interstellar flight. They can perform planetary scanning tasks in a 'searchlight' fashion and lock a planet inside a force field inside of which they can incinerate it in 20 minutes.
They appear to have a very factual, analytical and emotionless kind of intelligence.
They are known to use extradimensionnal prison in which they lock up galactic criminals.
Source: Doctor Who Universe, (DW: The Eleventh Hour)

ALIEN PIC OF THE DAY

UNAMED SPECIES FROM SPACE PRECINCT

ZARANITES / ZARANS

Planet of Origin: planet Zaran II, the second planet of the Byrdica/Zaran system.
The Zaranites are a mammalian humanoid species known to the Federation during the mid-23rd century. They are fluorine breathers, requiring them to wear gas masks and protective suits in Earth-like environments.
The Zaran are a hunting species, and the females are known to have psionic powers which enable them to attract males by arousing hormones in both sexes. The arousal of hormones means that a life-bond is formed between a couple. The Zaran were first encountered by humans in the 2070s, and soon came under the control of a group of humans known as the Totality. The jewelry they wore is made from horns of the Berbbotjahaa; the top part of the necklace indicates their family, while the bottom identifies each individual.
The Federation made its diplomatic first contact with this race in 2257.
Source: Star Trek

THOLIANS

Planet of Origin: Tholia (Tholis)
The Tholiansare an extremely xenophobic, non-humanoid hermaphroditic silicon based species with a propensity for precision who developed a space faring civilisation as of the 22nd century.
They are living mineral formations with their cells being mostly crystalline although they are believed to contain a fluid medium which carries out metabolic processes. Their skins are mostly faceted with each Tholian seemingly bearing a unique color scheme with an infinite variety of tones being present amongst them.
They breathe through a form of anaerobic respiration with a methane-chlorine mixture being used. While their cells' functions resemble those of humanoid cells, Tholian cells contain an electrical charge in each cell nucleus. The Tholians also possess some form of electromagnetic organnelle within their bodies.
Tholians are approximately the same height as a Human and are incased in an exoskeleton. They have six thin legs that makes it possible for the being to move in any direction quickly; the legs are articulated with joints roughly corresponding to the knee and ankle of humanoid species. Each leg ends in a multi-toed foot. The legs are attached at the base of the torso and are radially symmetric. There are two arms; each has joints analogous to the humanoid elbow and wrist, and each arm ends in a multi-fingered hand. They have no neck but two glowing spots near the top of their torso. They turn these to face individuals with whom they interact, which suggests they have some sort of information-gathering organ. Tholians have two sexes, but each individual had both sets of sexual organs. They exist at high temperatures – in excess of 450 Kelvin (177 °C, 350 °F). They can tolerate lower temperatures for a brief period of time; if they are exposed to too low temperatures, their carapace cracks. In temperatures even lower, a Tholian would freeze solid and shatter.
The Tholians possess a form of networked intelligence in addition to their sentience as individuals. Whilst they do share their memories between generations or familial structures, the process did not create a "hive mind". They also possess a kind of shared memory archive for their species known as the Lattice.
Tholians are naturally able to emit various forms of radiation, which they can modulate to communicate over short distances but they communicate primarily through a series of clicks and chirps.
The head governmental unit of the Tholians is the Tholian Assembly. During the mid-22nd century, the Vulcans had limited contact with the Assembly. Contact with the Tholians over the next century would be sporadic but aggressive and territorial. Tholians rarely advanced very far from their home system, and are known to kill outsiders caught trespassing in their territory. They were also known to frequently annex surrounding systems outside of the Assembly, to further isolate their territory.
Source: Star Trek: (ENT: "Future Tense", "In a Mirror, Darkly"; TOS: "The Tholian Web"; DS9: "For the Cause"; TNG: "Captain's Holiday")

OMARA / OMARANS

An aggressive humanoid species which developed an expansive space faring civilisation, "The Omara are a nomadic species from beyond the Rim worlds. Theives and killers who have raided dozens of planets..." Their forces were wiped out in the 21st century by a batalion of the League of Planets jsut prior to an attempted invasion of planet Altor in the Epsilon Eridani system.
Source: Space Precinct, Seek and Destroy

MELMACS / MELMACIANS

Planet of Origin: Melmac, which was destroyed in the 1980ies, leaving but a few survivors.
Melmacians are a species of short-statured sapients of omnivorous mammalianoid, furry bipedals with dense, usualy brown fur covering their entire bodies, except for their faces, they have large feet and four-fingered hands. They have a lifespan of around 650 years. By the inclusion of a plant called the Carl Shrub in their diet, Melmacians are also immune to infectious disease. Their blood is green-colored and they have ten major organs in their bodies, eight of which are stomachs. When a Melmacian eats excessively, instead of getting fatter like most species, they get denser. Eating enormous quantities of food might be extremely dangerous, as it puts them at risk of physical implosion. If a Melmacian spends too much time without eating enough, they will partially lose their sense of reality and start regressing to a hunter state, searching for food in the wilds.
Melmacians have developed an advanced space faring civilisation.
Source: Alf


* Gordon Shumway, more commonly known by his nickname, ALF, was one of the survivors of the great catastrophe that befell the planet Melmac. He made it to Earth and lived with a Human family for a few years in the 1980s.
* Skip was a male Melmacian who was another survivor of the destruction of Planet Melmac.
* Rhonda was a female Melmacian who was another survivor of the destruction of Planet Melmac.

KLIBEN

Planet of Origin: Kliben
Kliben are a sentient bipedal species that developed an advanced civilisation with space travel capacities as of the 21st century. They are purple skinned and have a large head with four tentacle like appendages coming out of its back. They possess two pair of arms with thick human like hands.
Source: Gerry Anderson, Space Precinct

OUTLANDERS

Planet of Origin: Outlander Homeworld, presumably not that far from Earth
The Outlanders are a race of humans of the Outlander Planet. They are conquerors and settlers. Circa 700 AD, They had invaded and conquered many worlds, including the Moorwen Planet, they use powerfull weapons and armors fabricated with super strong metal.
SourceL: Outlanders Movie