IZARIANS

The Izarians are an humanoid species that developed a technologically advanced civilisation on a planet orbiting the star Izar.
They have developed teleporters on an interplanetary scale and advanced bioengineering and cybernetics which allow them to create large artificial beings and to modify themselves. High ranking officials will usually have undergone extensive modifications, often giving them giant proportions and non-standard physical features.
They came to Earth some 200 000 years ago with prospect of invasion but halted their plans upon discovering the planet atmosphere was not fully compatible with their biology. Their scouting party nevertheless stayed on Earth and established a secret base at the bottom of the Pacific ocean.
Toward the end of the 20th century, they realised that their homeworld was doomed as another planetoid was on a collision course with it. They reestablished plans of Earth conquest but were defeated.
Source: MagneRobo Gakeen TV series

MAKUU / C-REX

Makuu aka C-Rex are an aggressive and expansionnist advanced species naively bent on universal domination under the domination of Don Hora/Don Horror/Lou IBMX-11, a monstrous six-armed idol-like being which lives in a large structure in a pocket universe. It remains unclear if this dimension is a crossroad between our universe and another one and if the Makyy actually come from it but Don Hora is able to conjure other temporary pocket dimensions to serve as arenas where his subordinates terminate his adversaries.

The bulk of the Makuu/C-Rex forces are composed of humanoids with vaguely reptilian features. the most advanced can assume human form and even transform into bulkier monstrous creatures. Given the diversity of monstrous form different specimen can adopt, it is most likely the result of manipulation of the individual, either chemical, genetical or else.
The Makuu/C-Rex were exterminated from this universe around the end of the 20th century.
Source: Space Sheriff Gavan / X-Or TV series

KALONIANS

Advanced Humanoid species with cut-steel-blue pigmentation from the planet Kalonia in the Wolf-Lundmark-Melotte Galaxy. They were pawns of the Eddorians.
Source: E.E. "Doc" Smith

CHICKLADORIANS

Advanced species of pink skinned humanoid with triangular eyes which evolved on the planet Chickladoria.
Source: E.E."Doc" Smith

VELANTIANS

Velantians are part of the Arisians Breeding program that developed on Velantia III They are an advanced reptilian species that developed space travel. Dragonlike, they are massive, winged and possess 2 pairs of eyes.
Source: E.E "Doc" Smith, David Kyle, Lensmen from Rigel

RIGELLIANS

Rigellians are part of the Arisians Breeding program that developed on the superhot, high-gravity world of Rigel IV. They are an advenced species that developed space travel. Monolithic, they are quadruped with an egg shaped body with four prehensile tentacles coming out the their middle and four mouth near their top.
Source: E.E "Doc" Smith, David Kyle, Lensmen from Rigel

EDDORIANS

The Eddorians are a psychic dictatorial, power-hungry shapeless species from the planet Eddore in another universe where the laws of physics are different. They were attracted to this universe by the observation that the Milky Way and a sister galaxy, the Wolf-Lundmark-Melotte galaxy might be passing through each other. The Eddorians believed that this would result in the formation of billions of planets and the development of life upon them. Dominance over these life forms seemed to the Eddorians the logical course of action. This dominance isexercised on their behalf by a hierarchy of underling races. The Eddorians themselves are physically similar to various lower Earthly life-forms, reproducing by fission but by a process more similar to budding than to cell division, except that each being's memories are preserved. They are highly competitive, extremely long-lived, and almost impossible to kill

Source: E.E. "Doc" Smith, Triplanetary

ARISIANS

Peaceful humanoid species that have developed what could be among the first sentient civilisation in our universe. They have forgone physical and developed tremendous mental power. Foreseeing the invasion of our universe by the Eddorians, a species from another universe, they began, over 2 billion years ago, a covert breeding program on every world that can produce intelligent life, with the aim of producing a means to eventually destroy the Eddorian race. Their work done, their plans are to remove themselves from the universe.
Source: E.E. "Doc" Smith, Triplanetary

ANDREENIDS / ANDRINOS

The Andreenids are an insectoid species indigenous to planet Eternia. Their body is roughly that of a winged humanoid. Although individuals have their own personnality, they follow a hive social structure. Distrustful and proud, they keep their contacts with other species minimal. They are not known to use any advanced technology.
Source: He-Man and the Masters of the Universe.

BULLTON

Found living in two meteorites which crashed on Earth in 1966, Bullton is composed of two small amorphous creatures which, when put one near the other, generate a gigantic centralized mass with several short tentacular limbs arrayed in all directions, many of which ended in orifices from which antennaes can extend which can emit energy whihc warp sapce and time. Bullton's body appears blue , gray and red. On a planet, it moves by rolling over.
Source: Ultraman "Passport ot Infinity"

MEPHILAS SEIJIN

Mephilas Seijin is an advanced species of biped with telepathic abilities which developed space flight. A Mephilas came to Earth in 1966 with projects of conquest. After being thwarted, it left the planet.
The Mephilas that came to Earth could fly, produce lightning bolt from their fingers as well as immobilizing rays, change size and teleport at will. It also had the power to resurrect dead individuals. It remains unknown if those abilities are natural or artificial, ot even representative of the species.

Source: Ultraman episode 33 "The Forbidden World"

ZARAB SEIJIN

Zarab Seijin are a an advanced species which developed space flight. They are 2 meters tall biped but can increase their size about 20 times and can change shape to imitate other lifeforms. It is not known if these abilities are natural or articificial.
Zarab Seijin came to Earth with intentions of conquest in 1966 but were thwarted.
Source: Ultraman

ZETTON SEIJIN

Zetton Seijin are a technologically advanced species of bipeds which developed space flight. They are 2 meters (6.56 feet) tall and weigh 60 kg. With two legs and two arms, they have a large cylindrical head with a with a kind of antenna organ on top of it. They can shapeshift but it is not known if this ability is natural or artifical.
They came to Earth in 1966 and attempted to conquer the planet using a 60 meters tall monster called Zetton. Zetton resembles a giant horned humanoid beetle with a glowing yellow streaky mouth down his face, striped yelloy black limbs and powerful black armor plates on the torso. The yellow panels on his chest are thought to be compound eyes. Where eyes are on most creatures, he has two sensory pits which can emit sonar or radar signals. Where ears would normally be are sensors that acquire the reflected signals. It can shoots 1-trillion-degree-Celsius Fireballs from his mouth, absorb energy waves and rays and recast them from his hands and create a protective force field around him. It is unlikely that Zetton is the product of natural evoluton and is most probably a creation of Zetton Seijin science.
Source: Ultraman TV series

BLASTERS

The Blasters are an aggressive green skined humanoid species reproducing themselves by cloning which seem bent on conquest of other planets. They tried to conquer Earth toward toward the end of the twentieth century but failed.
All blasters look the same and are dressed the same, their only differentication being a numeric identification on their costume over the forehead.

Source : Astroganger TV Series

VOLTRON CONQUERED SPECIES

The Galra have conquered at least two other civilisations of humanoid species that they use as slavelabor. Source: King of the Beasts GoLion / Voltron Lion Force TV series

GALBESTON / DRULES

The Galbeston (also known as the Drules) are an aggressive technologically advanced humanoid species which developed an interplanetary society.
The Drules are physically relatively close to humans but with blue skin and red eyes.
They have developed an oppressive monarchic society.
They may of may not be related to the Galra.

Source: Kikou Kantai Dairugger XV / Voltron: Vehicle Force TV series

GALRA / DRULES

The Galra (also known as the Drules) are an aggressive technologically advanced humanoid species which developed an interplanetary society through invasive expansionnism that originated of planet Galra, also known as Planet Doom.
The Galra are physically relatively close to humans but with pointed ears that enlarge with age. Their eyes are yellow and their skin color can be of all tones of blue. The ruling class seems to be of a median tone of blue while most of the populace seems to be of a darker blue. Children all have lighter tones of blue that darkens as they age.
They have developed a monarchic society based on conquest and slave collecting.
Some Galra are said to use some kind of magic.
They may or may not be related to the Galbeston.


Source: King of the Beasts GoLion / Voltron Lion Force TV series.

LEPONTINES

Lepontines are bovine modified genetically by representatives from an alien civilisation in need of warrior monks to lead their crusade in their place.

Source: Ghislain Barbe & Elie Charest "Earthbound"

EVIL HORDE

The Evil Horde is a spacefaring agressive power bent on conquest lead by a mysterious entity known as Horde Prime.
The few high ranking officers of the Horde, humanoid for the most part, all seem to be unique specimens, with might hint at some artificial origins or manipulations - either genetic or mystic, of the individuals. All are known to have special powers and often use magic. The bulk of the Horde's Power is composed of mass-produced humanoid robots.
Horde Prime and the Horde troopers bear a lot similarities, with the Beast and its army seen in the film Krull.

SNAKE MEN / REPTONS

Snake Men are a species of humanoid saurians who developed as an agressive spacefaring civilisation. They invaded planet Eternia in the distant past and were defeated. There now remains only a handful of them and most of them have devolved into the more peaceful reptons.