Thanagar is a science-based world without poverty and crises. It is run by a single government called the Ruling Council and no police force was needed until an alien race called the Manhawks started stealing for the thrill of it. As a result, the Hawk-Police (or Wingmen) has been established. Order and justice was restored, although some Thanagarians had adopted the concept of criminal acts. However, as time went on they were considered being an expansionist planet which plundered and stole from other worlds, thus the Hawk-Police was corrupted.
Thanagar was one of the few planets that united, willing to invade Earth making it a slave planet, which Thanagar had been millennia ago being conquered by the Polaran Empire. During this era, Kalmoran, a proud Thanagarian led an army of three thousand, driving the Polaran's away and attacking them at their home planet. After these events, Kalmoran became ruler and was considered the first and greatest hero. As time went on, Thanagarians developed spaceships and started to explore the galaxies sending spies to study other planets, which ironically ended up them conquering other planets stripping them of their inhabitants and culture and making them slaves of Thanagar. With this planets they conquered, they was known to be the protectorates of the Thanagarian Empire. The Thanagarian Empire was eventually overthrown by Onimar Synn, who had taken control of the Nth Metal, but later was defeated by Hawkman. He then returned in the Rann-Thanagar War.
During a battle with Adam Strange, the leaders of a top class group of Thanagarians teleported planet, Rann to the Thanagarian System, hoping to create some kind of dictatorship amongst the two planets. However, this catyclysm ended in an all out war between the people of a Rann and the Thanagarians. While this battle took place, Tigorr of the Omega Men discovered a stray Thanagarian surveillance satellite, which had footage of Superman-Prime forcing Thanagar out of the orbit. As a result, Adam Strange gathered the combined forces of Thanagar, Rann, L.E.G.I.O.N., and New Cromus which was led by the hands of Kyle Rayner, known as Ion at the time to make a full force assault on the sources behind this catastrophe. Thanagarian weaponry is now appearing on Earth, as a result of the Secret Society of Super Villains smuggling them inside.
Powers & Abilities
The Thanagarians are powerful people with greater strength and durability than humans, they possess enhanced senses - especially vision and hearing - and their life span is significantly greater than that of a normal human being, too.
They discovered the Nth Metal (or Ninth Metal) on their home planet Thanagar and use it for their artificial wings and anti-gravity belts. Wearing the Nth Metal, it makes them even stronger and enables them to fly at great speeds. It also protects the wearer from the elements and lets wounds heal much faster. The full power of the Nth metal has yet to be revealed.
The Thanagarians are capable of communicating with birds and use them as their allies and spies.
The Thanagarians and their planet Thanagar were created by Gardner Fox and Joe Kubert as the origin of the Silver Age Hawkman (Katar Hol) and Hawkgirl (Shayera Hol) in The Brave and the Bold #34 published by DC Comics.
In The Brave and the Bold #34 the Thanagarian police officers Katar and Shayera Hol travel to Earth in pursuit of a shape-shifting criminal and thief named Byth. They use the electric brain on their space ship to learn about Earth's culture and language quickly. When they land in Midway City, they introduce themselves to the local police commissioner who is fascinated by their story and the fact that they are alien police offers. The commissioner provides them with Earth identities -Carter and Shiera Hall- and they continue their chase for Byth. After successfully defeating Byth and, as a prisoner, sending him back to Thanagar, the commissioner asked Hawkman and Hawkgirl to stay in Midway City.
The Thanagarians appear in several episodes of the Justice League and Justice League Unlimited animated series. The animated Thanagarians appear to have actual wings as part of their bodies and they are much more expansive and evil-minded people. As part of their (animated) history, they were once a very primitive and savage culture that sacrificed their own children to their Gods in return for agriculture, mathematics, and philosophy - the foundation of their entire culture including the Nth Metal.
Justice League animated series
The Thanagarians came to Earth posing as mankind's only hope against the Gordanians who were on their way to Earth in order to enslave it under their rule. Under this guise, the Thanagarians planned to use a device that would both destroy the Earth and give the Thanagarians access to the Gordanians home world, allowing them to once and for all destroy the Gordanians. After Batman found out their real plans, Hro Talek, the Thanagarian commander, was forced to put the Earth and its defenses and communications offline while they built the supposed shield to protect the Earth. Only when Batman crashed the Watchtower into their "little science project" was the device destroyed, crushing the Thanagarians hopes of taking over Earth. Hro Talek retreated with his men in order to find another planet to use in their hyperspace bypass project after realizing that Hawkgirl had fallen in love with Green Lantern John Stewart.