BAJORANS / PROPHETS / PAH WRAITHS

Planet of Origin: Bajor, the 7th planet orbiting the star Bajor-B'hava'el, an earth type planet with five moons. A Day on Bajor has 26 hours. Bajor's atmosphere has a greenish tint; as a result, oceans viewed from space will appear more green than blue.

The Bajorans are a pacific  humanoid species who developed advanced civilisation about 500 000 years ago and started space faring in the 16th century. They were invaded in 2328 by the Cardassian Union, with who they had aligned themselves some time before. They were occupied for 40 years, during which time many Bajorans were forced into slave labor. Many fled and hid in refugee camps while other got involved in the terrorist resistance movement. In 2369, the Cardassian civilian authorities ordered the military to withdraw from Bajor, after which the Bajoran provisional government invited the United Federation of Planets to set up base in the system and requested membership into the Federation. Soon after, a stable wormhole was discovered in the system, making it a strategic position on the galacitc scale and a key entry point for the Dominion, an invasive civilisation lying at the other end of the Wormhole. Bajor finally formally joined the Federation in 2376, the year after the Dominion War ended.

The Bajoran people were originally divided into castes, called d'jaras. When the Occupation began, the d'jara system was abolished.

The Bajoran religion, known as the Way of the Prophets, is the major unifying force on the planet. Its religious figures are entities refered to as The Prophets, or "Wormhole Aliens" which, also they claim to be of Bajor, exist within the system's wormhole, referred to as the Celestial Temple by the Bajoran people. Their motives remain unclear; on several occasions they proclaim their disinterest in the physical world, while at other times actively participate in the physical world, most often in the general interest of Bajor and its people. People who followed the will of the Prophets are said to be permitted to enter the Celestial Temple and dwell with the Prophets upon their death. The Prophets are also believed to have given Bajor its main religious artifcacts, were discovered 10 000 years ago, the "Tears of the Prophets", crystalline, hour-glass shaped orbs , glowing and  floating within their containers and have powers defying scientific explanations, the most common being to stimulate visions that are beleived to communications from the Prophets. Some prophets, known as Pah Wraiths, are said to have been imprisoned by their kin on Bajor in a physical prsion known as the Caves of Fire for having tried to seiz control of the Celestial Temple in the past.

Source: Star Trek Universe

ASGARD

Planet of Origin: Unknown, in the galaxy of Ida
The Asgard are diminutive humanoid species which developed a benevolent highly advanced space-faring civilisation governed by a Hihg Council.  They were once part of an alliance of four great races with the Ancients, Nox, and Furlings and visited Earth during antiquity and protected a number of planets in the Milky Way, mianly from the Goa'uld with whom they signed The Protected Planets Treaty is an armistice between the Goa'uld and the Asgard, first referred to specifically in "Fair Game" when Earth is included. The treaty covers 27 planets including Earth,^[6] and ensures that those planets remain free from Goa'uld domination. Other planets in the treaty include Cimmeria,^[1] K'Tau,^[11] PX3-595,^[13] the second planet of the Adara system,^[3] and Galar.^[14] . As of the 20th century, the Asgard are a dying race. Having lost the capacity for sexual reproduction, they perpetuate themselves by transferring their minds into successive cloned bodies, leading to an irreversible degeneration of their genome. They chose to commit mass suicide in the beginning of the 21st century, having arrived at the end of their degenerative cycle, by exploding thri homeworld to prevent that their knowledge fell into the wrong hands.
A renegade faction of Asgard splintered from the others 10,000 years ago over their belief that they should experiment on humans to solve their cloning problems. They traveled to the Pegasus galaxy and continued their experiments, but were forced into hiding after the Wraith defeated the Ancients. 
Amongst the most significant technological advancements of the Asgard are beaming technology, intergalactic hyperdrives, advanced shiled technology and plasma beam weapons. They are very advanced in cloning techniques and have the technology to upload and store consciousnesses and transfer them to new bodies. Neutronium is a key element of Asgard technology. Source: Stargate Universe

AMNION

Amnion is an adavnced space-faring vaguely humanoid species which looks like " "a humanoid sea-anemone with too many arms." They differ greatly in appearance from one another, with differing numbers of limbs, eyes, and other organs, as well as  in size and shape. While being physically very different, they share a hive mind with the major instinctive drive of the expansion and propagation of the Amnion species, leading them to assmiliate other species by turning them into members of their own.

They possess  mutagenic technology that gives them the ability to rewrite the DNA of a non-Amnioni to turn him into an at least partially Amnion. Basic life processes remain intact, but protein and DNA structure are radically different. The new mutants can breed with each other (though not with mutated members of other species) and display a significantly increased level of intelligence.

First contact was made betwwen them and humanity while humanity was already travelling interstellar journeys.
Source: Stephen R. Donaldson's The Gap Cycle

GREATEST AMERICAN HERO ALIENS

Planet of Origin: Unknown, formerly a garden planet, now a wasteland. Its name is unpronouncable by humans.

The alien seen in The Greatest American Hero is from a green skinned humanoid species that developed an advanced technological civilisation. They had use of spacecrafts, teleportation and suits enabling their wearer to use flight, super strength, resistance to injury (including direct bullet hits to areas covered by the suit), invisibility, precognition, telekinesis, x-ray vision, super speed, pyrokinesis, holographic vision, shrinking, psychometry, and sensitivity to the supernatural.

According to the alien, his planet (which now looks remarkably like Mars) used to be a garden planet but is now a wasteland. He is therefore, as of 1983, among its rare survivors. He came to Earth to give a human one of their suits with which he hopes humanity will be saved.

Possibly coming from the same planet as him is a small creature floating in the air which ressembles a small snake with a torso, two arms a vaguely humanoid head on which is a long articulated antenna.
Source: The Greatest American Hero Tv show, ABC, 1981-1983

GAMILAS

Gamilas are a hibe-minded bipedal species which developed an advanced space faring civilisation.Knowning their planet doomed, they tried to invade Earth around 2199 and eradicate humankind. This decision caused a split of the hive personnality, one portion of it being against destroying another species. It sent technological information to Earth that would allow the humans to defend themselves. The Gamilas were eradicated.

Source: Space Battleship Yamato live action.

SLENDERS

Slenders are a species of tall circa 4 meters tall grey humanoids who developed an advanced space faring civilisation. They are an intrusive species, harnessing other species such as  skitters  and humans to control them and armed Mech drones to ensure their security. Graceful and slender, they can move very quickly in an Earht type gravity and appear to have features ressembling cetacean mammals. They are the apparent power behind the invasion of Earth. 

Source: Falling Skies