Green Lantern's History
Alan Scott is the Green Lantern of Earth 2. After nearly dying in a train crash, Alan was given the power of The Green, to fight the threat of the The Grey.
Origin
Alan Scott was a young, openly gay media mogul who dedicated his work to the heroes who gave their lives three years prior in the war against Darkseid. He was in a relationship with Sam Zhao and while on a business trip in Sam's native China, he worked up the nerve to propose. Unfortunately, just before Sam could accept the proposal, the train crashed suddenly, killing nearly every passenger except Alan - including Sam.
After the crash, a Green Flame appeared before Alan Scott and told him that he had been chosen to become the protector of the Earth. With a threat on the horizon, it urged Alan to accept the combined power of the Earth's energies, using the engagement ring intended for Sam as a conduit for that power. This would allow him to create green energy constructs, limited only by his imagination. Though the Green Flame had saved Alan, it could not do anything to save the others, and so Alan accepted the offer for the sake of his lost love and the others who died.
Almost as soon as Alan became the protector of the Green, an opposing force chose its own Avatar. The Grey chose Grundy as its champion, and the dead man began sending the force of decay throughout the earth. He waited at Washington, D.C. for the Green's protector, claiming that they could not co-exist.
Alan, upon seeing the destruction caused by Grundy, went to confront him, and was joined by other heroes; The Atom, Hawkgirl and Flash. During the battle, Alan realized that the only way to defeat Grundy was to confront the Grey. Alan sent his essence to confront the Grey but the Grey used the image of his dead lover, Sam, to tempt him. However, Alan soon saw through the deceit and left the grey, returning to his body.
In order to defeat Grundy, he dragged the man to the moon, where he would be so far removed from the Grey as to be powerless. However, having been disconnected from the Green himself, and after exerting the last of his power to throw three nuclear missiles into outer space, Alan crashed down towards the Earth. At the last second, he was saved by Hawkgirl.
Once back on the ground, the Flash laments the havoc wrought by the powers of Grundy, whom before his defeat had succeeded in eradicating almost all plant life on earth. The Green Lantern, driven by instinct proceeds to focus the earth's energies and release them into the ground; causing new sprouts and crops to form at the area the energy touched. When the Flash inquires on what exactly he did, Alan replies that much of what he does is instinctual and that he's only partly aware of what he's doing, but that he believes that he has given the earth the boost it needs to rid itself of Grundy's decay.
The Flash then goes on to suggest that they form a new trinity, like Superman, Batman and Wonder Woman before them. However, his youthful glee is immediately shot down by Alan who states that although he is grateful for their assistance against Grundy, he doesn't agree. Amazed at the scope of his own powers, and embittered by his recent loss Alan instead tells them that further assistance is unnecessary and that his power alone is sufficient to protect the earth. Reasoning that as long as he doesn't play "Icarus" again, he'll remain unchallenged. Having made his statement, Scott takes off and leaves Hawkgirl and the Flash to ponder what to do next.
On the next day, its revealed that not only did the Green Lantern succeed in restoring nature to its former glory, but that his influence has caused the Amazons to grow to encompass an even greater area of Brazil than they did before the coming of Grundy. However, at this time, the reality of his loss has finally hit Alan, and he wakes to find himself angry at the world for taking his beloved Sam away from him. In a grief-induced rage Alan proceeds to decimate the interior of his penthouse apartment, destroying it in an effort to vent the emotions that's only recently escaped his steely conviction.
After having collected himself somewhat, Alan walks out to the balcony where he discovers Hawkgirl waiting for him. Impressed by how she managed to deduce his identity as quickly as she did, he engages in a conversation with her, inquiring on how she managed to discover his secret identity. She answers that she merely put two and two together in regards to the information acquired on the news, and that she came to the conclusion by examining his physicality and height. Hawkgirl then proceeds to unmask herself and reveal her name while making attempts at making Alan reconsider his earlier decision to deal with the threats on his own. Alan, as a billionaire and a successful businessman states that he's still uninterested, as he's never been a man of teamwork, trusting in his own abilities and achievements above those of others.
Kendra reminds Alan, that although he might have great powers, without Sam's ring he's just like any other man. Demonstrating her point by shooting a bolt from her crossbow that catches the ring on its shaft and pierces through an adjacent photo of Sam and Alan and pins it to the wall. Enraged at this hostile act, Alan summons the ring to his finger before he whirls around to face her, only to find her already gone.
Some time afterward, Alan has taken the time to visit Sam's grave in China together with his would-be father-in-law Mr. Zhao. Although Mr. Zhao never approved of Alan's relationship with his son he still admits that even he saw how happy Alan made him, and that he would rather his son be gay and alive than dead and gone. Soon Alan reveals that he blames himself for Sam's death, believing that he was intended target of the attack. Mr. Zhao however refutes this immediately and states that he's done some investigation on his own and there are many rumors which point to a single thing. That the intended target of the attack was none other than Sam himself.
Later, Alan fights his way trough the various Chinese gangs, hell-bent on finding answers about why Sam was murdered but regrettably none of the gang members knew the reason he was targeted. Having found no answers whatsoever despite his efforts, Alan seeks out Hawkgirl in Louisiana and admits that he might've been wrong to say that he didn't require any assistance, hoping that she can help him discover why Sam was killed.
Together with Kendra, Alan manages to learn much more about Sam, and within the span of a few hours the treasure huntress has completely outclassed all of the detectives earlier hired by Mr. Zhao. They are flying above the Chinese harbor when Kendra notes that they have reached the point where there was supposed to be a clue, as one of the containers contain something which is connected to Sam's death. Once they open the container however, Alan and Kendra discover to their shock numerous dead Parademons heaped atop one another. Surprised by their findings and wondering how this got Sam killed, they decide to backtrack to their previous source, the mob leader Eddie Kai Lung.
Unfortunately, before they can continue their search the Green reaches out to Alan and implores him to return to America. While Alan resists as much as he can, the force of the command proves too irresistible and he's forced to leave Kendra behind despite her protests, when he leaves however he begs Kendra to keep looking in his place.
Tower of Fate
Alan ended up in Boston, where Flash and Doctor Fate were fighting Wotan. Alan helped Flash protect the pedestrians and keep the World Army at bay. After Fate defeated Wotan, Alan and the other Wonders escaped to Alan' penthouse to hide. The three discussed what to do next, but as they were Fate told Alan to turn on the TV, because he had a vision of whats about to happen. Alan turns on the TV to discover that Steppenwolf has taken over Dherain and the World Army is declaring war on them.