Ultimate Green Lantern
The Origin: Dishonorably discharged by the military's highly trained Delta Force, John Stewart's life is going nowhere... until he's recruited into the intergalactic police force called the Green Lantern Corps. A rookie grunt assigned to Sector 2814-Earth, Stewart's mentor is the corps most senior officer: Sinestro.
The Character: No one knows why Stewart was thrown out of Delta Force but as he puts it "I had one bad day" A social activist now in Los Angeles, Stewart's happy to serve out his days not fighting in anyone's wars, until he's given the power to truly make a diffrence.
Supporting Cast: A slew of Alien GLs fill the title, but Stewart's main interaction is with his training officer Sinestro. A brilliant strategist and one of the most powerful Green Lanterns ever, Sinestro will give John Stewart-and the reader- the vibe that this Green Lantern may be furthering a dark agenda.
The Set Up: Trained by Sinestro, Stewart quickly gains a reputation as a hotshot upstart. And, like his fellow officers on the GLC planet Oa, he still never sees their commanders called the Guardians, who are said to give the rings their power.
The First Arc: Think "Training Day" in outer space. The rookie GL asks " What happened to the other Green Lanterns before me?" "Simple" says Sinestro with a smile. "It didn't work out." As Sinestro reveals his shadier side while the story progresses, Stewart grows more and more interested in just where the Guardians and his new ring and power battery come from.
The Big Picture: Over time, Stewart discovers the Guardians are dead-killed by Sinestro, who's been secretly running the Corps for some time now. He also learns that his mentor has been giving rings to inadequate Green Lanterns to dupe the various solar systems into a false sense of security, mudering any Corps member who gave Sinestro any potential opposition, Hist ultimate goal: The creation of robotic Manhunters deep inside Oa to destroy the flawed GL Corps, subjugate the planets under their protection and set Sinestro up as the conqueror of the Galaxy.