Maltus was among the first planets on which planetbound humanoid sentient life evolved. It happened very similarly to Earth. The planet had it's era of dinosaur-like creatures previous to a humanoid race. Along with the humanoids, another organism, the symbiotes, sprung up. The microscopic ymbiotes merged with the humanoids and gave them their advanced intellect, a proactive immunity system along with the building blocks to immortality. They were the source of all the powers granted to the race of humanoids that eventually evolved into the Guardians of the Universe.
Physically. they started as tall dark blue humanoids with black hair. Males and females drifted apart after a plague whose virus was only avtice in the presence of both sex. Even though the virus was eliminated , males and females remained apart during millions of years but have recently reunited. In the meantime, they evolved into short
Some 4 billions years ago, they left their homewrold to reeastablish on Oa, and shortly after, learned how to manipulate the energy they called "the Glow", the collective willpower of the inhabitants of the universe and eventually created a Central Battery to store it. This gave the Guardians an ultimate tool to pursue their goal of shaping an orderly universe.
An army of robots called Manhunters was created to patrol the Universe. They rebelled and were exiled. After this failed experiment, they invented the Green Glob, an intelligent teaching machine, programmed to educate mortals all over the universe and able to briefly alter reality to do so.
Then came the short-lived Halla's, an intergalactic police corps wielding power guns chanelling the Glow energy, wich paved the way for the Green Lantern Corps. These troops were given some of the power of the Central Battery, accessed through a ring.