John Stewart is an African American male with a slender build and short black hair. Unlike Hal Jordan, he does not wear a mask to conceal his identity. His costume is mostly black, except for green parts on his wrists and on his shoulders and upper chest. He also wears the Green Lantern Corps symbol on his chest.
After mutated plant creatures sprouted up all over the world, John analyzed a sample for Batman, finding traces of Kobra-Venom within the plants. John later helped fight the plants in Metropolis.
After being made a slave of the Light's mind control, John Stewart welcomed Vandal Savage aboard the Watchtower with a silent kneel of obedience. In the time he was enthralled, the Light used him and five other Leaguers to attack Rimbor. For sixteen hours, they went on a rampage, and told all present to beware the Justice League, and Earth.
John Stewart was one of the six Leaguers on an away mission who was recalled to the Watchtower. This was Vandal Savage's response when the Team successfully disconnected Plastic Man, the Atom, Captain Atom, and Hawkman from Klarion's control. Upon his arrival, the Green Lantern incapacitated the vaccinated Red Tornado, allowing for the enthralled Superman and Wonder Woman to tear off the android's limbs and remove him from the fight.
When the Team arrived, Stewart was taken out by Sphere. Robin placed a cure-tech patch on him.
Green Lantern was dispatched to the Museum of Natural History to back up Artemis's Alpha Squad. Seismic activity had made the roof collpase, and several hostages still needed to be escorted to safety. Stewart created a dome around them and they slowly made their way to the exit. Alpha Squad made short work of several groups of Shadows that ambushed them in the museum's halls.
In the wake of an alien attack on the United Nations, Stewart briefed the League and the Team on their visitors. Lobo was dangerous, but not likely to return. The other was a Krolotean, and he would not be alone. Adam Strange informed them about technology theft on Rann, which John connected to the Krolotean way of life of stealing everything. Strange also told them that the League couldn't go to Rann, because six Leaguers—including Stewart—were wanted criminals. Nightwing made the connection to them being mind controlled, five years earlier, and John Stewart admitted that, though they investigated it, they never considered that their unaccounted actions would have taken place off-planet. It was decided that the Team would send a Squad to Rann, and the others would split up to deal with Krolotean presence on Earth.
John waited for Zeta Squad to return from Rann, and listened to their report. He was not aware that he, or any of the other Leaguers, were wanted criminals on Rann or Rimbor, because neither planet was in his sector. After discussing with Wonder Woman and Captain Atom, he decided to consult the Guardians of the Universe.
The Guardians thought it wisest if the six Leaguers journeyed to Rimbor to defend themselves for the High Court. Hal Jordan and Guy Gardner would travel ahead to make sure they received a fair trial.
John Stewart watched as Superman pleaded his case to the Tribune. When the trial was interrupted by a message that the Reach was on Earth, John explained their history to Martian Manhunter.
Rimbor June 20, 00:16UTC
After Icon rejected the chance to offer something "more" to the tribunal, John Stewart and the other Leaguers were found guilty on all counts and taken away. Not until Miss Martian, Superboy and Adam Strange presented new evidence and pleaded their case was the Tribune swayed to reconsider and declare that the charges were dropped and the Leaguers were to be released.
Rimbor June 20, post-00:16UTC
As the six Leaguers walked the streets of Rimbor, ready to return to Earth, Vandal Savage broadcast a message through holographic monitors to the citizens of Rimbor, declaring Earth off limits to incursion or invasion and threatened retribution against those who breached Earth's security. The Leaguers then noticed the Warworld, a giant satellite, passing through Rimbor.
Mount Justice June 20, 23:16EDT
John Stewart and the other Leaguers on Rimbor returned to Earth. Superman wondered if they were too late but then the Team arrived, with Aqualad informing them that the Earth had been saved but at a cost.
John Stewart joined Guy Gardner, Hal Jordan, Superman, and Captain Marvel in escorting the Reach flagship away from the United Nations building and into space. Upon leaving the Earth's atmosphere, the Green Lanterns accompanied the Reach fleet remnants towards Oa, where they would stand trial before the Guardians of the Universe.
John Stewart was the second replacement for Hal Jordan (after Guy Gardner), but the first permanent. Unlike Hal Jordan, he chose to reveal his secret identity, and lived on Earth with his wife, Katma Tui, and several other Lanterns. After Katma's death, the destruction of Xanshi due to his arrogance, and the destruction of the Corps, he joined the Darkstars, another interstellar police force. With the rebirth of the Corps, John has become Hal Jordan's sector partner.
Stewart's prominence in the DCAU as the Green Lantern in Justice League and Justice League Unlimited has led to a rise in popularity. The costume he wore in Justice League was adopted by the mainstream version (and the Young Justice version), and his background as a marine was added to his biography. He was also added to the roster of the Justice League of America.
John Stewart was designed by character designer Jerome Moore. Moore also redesigned the Green Lantern logo, to give the character more individuality, but was told by legal guardians at DC Comics that the iconic Green Lantern symbol could not be altered. The final design uses the iconic symbol.
This is the third animated appearance of John Stewart, who debuted in 2001 on Justice League and had a background cameo in the Duck Dodgers episode "The Green Loontern".