M SPACE HUNTER NEBULA ALIENS / M宇宙ハンター星雲人, M UCHUU HANTA SEIUNJIN

Planet of Origin: a dying Earth-like planet in the M Space Hunter Nebula.

The M Space hunter Nebula Aliens are an insectoid species looking much like human-sized cockroacheswhich developed sentience and civilisation after the fall of the previous owner of their homeworld disappeared, leaving behind a dying planet, long plagued by pollution. It remains unknown if those previous inhabitants left the planet or became extinct but they were said to have been much closer to humans than the insectoids are. It also remains unknowns if they themsleves developed space faring technology or if they inherited it from their predecessors .

The insectoids made a desperate attempt to invade Earth in the 1970ies, disgused as humans and using the alien monsters Gigan and King Ghidorah they controled via technoloigcal means but their attempt was thwarted by the earth mutant monsters Godzilla and Anguirus. They later formed a deal with the seatopian human subculture living under the earth and showed them how to control the Gigan cyborg but with as disastrous results. The exact nature of their deal remains unknown.

Source: Toho Universe, Godzilla vs. Gigan (1972), Godzilla vs. Megalon (1973).

UNIDENTIFIED ALIEN TEAPOT / UFO

DORCONS

Planet of Origin; Dorca, in another galaxy of the Local Group, the same as Psychon.
The Dorcons are a humanoid species looking much like humand who have developed an expansive advances civilisation. They are conquerors who have built a vast interstellar empire. They have been known to have attacked Psychon in the past and use Psychon brain stem to achieve immortality.
Planet Entra and its lunar penal colony Ellna are probably part of the Dorcon empire.
Source: Space: 1999

PSYCHONS

Planet of Origin: Psychon (in another galaxy of the Local Group). Psychon had one moon, similar to Earth's one. As of the end of the second millenium, the planet has become geologically unstable.
Psychons are humanoids looking much like humand who developed an advanced civilisation and some space faring capacities. Some psychons are known to have developed psionic powers allowing them molecular transformation and/or mind control.
After attempted invasions by the Dorcons who abducted numbers of Psychons, the planet was left unstable. Either to find an new home or escape their aggressor, most of the inhabitants of the planet had left it by the beginning of the third millenium, leaving only the scientist Mentor and his daughter on the planet, trying to stabilise it with a biological computer named Psyche. Some escapees made contact with the Croton civilisation. Their insertion was complicated by the attempt by one of them to seize power through mind control.

Source: Space: 1999

NIMONS

The Nimon are large black-skinned humanoids resembling minotaurs thant developed an advanced space faring civilisation. They used artificial black holes as a gateways from planet to planet. While effective, this technology required massive amount of energy. Due to their high energy needs, the Nimon undertook migrations they called the Great Journey of Life. Usually, one Nimon was sent to a planet, acting as a god and displaying advanced technology. They would construct a maze-like Power Complex, a building-sized labyrinth of circuitry designed to generate a new black hole which it then used to transport more Nimon to the planet, using capsules. The Nimon would then drain that world dry and move on.
Nimons could drained energy direct from their victims, leaving them as husks and shoot blasts of energy from their horns.
They were 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). Later on, they are known to have used exhausted Crinoth and were preparing to move to Skonnos, home to the faded Skonnos Empire when their black hole travel system was tampred with. Their status afterward remains unknown (DW: The Horns of Nimon)
Source: Doctor Who Universe, Horns of the Nimons

UNAMED ALIEN OF THE DAY

An homemade aliens on sale for adoption in Lindsey Banker's Etsy shop.

DINGUILS

The Dinguil civilization originated near the Orion Arm of the Milky Way. They were a philanthropic race that developed interstellar travel.
10 000 years ago, learning that waterworld Aquarius was approaching Earth, they came to conduct a massive rescue effort. The Dinguil saved many people from the flood. However, the humans they brought back with them eventually conquered them and wiped them out.
In 2203, The surviving Dinguil humans tried invade Earth after Aquarius flooded their home but failed.
Source: Space Cruiser Yamato

ILLUMIDAS / HUMANOIDES

The Illumidas are an aggressively militaristic humanoid species that developed an interstellar civilisation in the 2900ies, at which time they invaded the Earth. They have a large space fleet and move through space planet by planet, seeking to subdue and exploit other worlds. They are green skinned and only males of the species were ever seen.
They were wiped out by the Arcadians after an attempt to misuse the powere those had betwoed on them.
Source: Leiji Matsumoto, Space Pirate Captain Harlock universe in "Arcadia of my Youth" movie and "Endless Road SSX" TV seies.

STRANGULOUS STILETANS OF JAJAZIKSTACK / JAJAZIKSTCKANS

Planet of Origin: Jajazikstack (now destroyed)
The Strangulous Stilletans were an aggressive sentient species who lived some billions of years ago. They were wiped out by the Silastic Armourfiend of Striterax.
Source: Douglas Adams, The Hithchiker's Guide to the Galaxy

STRENUOUS GARFIGHTERS OF STUG

Planet of Origin: Stug (now destroyed)
The Strenuous Garfighters were an aggressive sentient species who lived some billions of years ago. They were wiped out by the Silastic Armourfiend of Striterax.
Source: Douglas Adams, The Hithchiker's Guide to the Galaxy