A Superman game starting at the beginning of his time as Superman, having to deal Luthor attempting to take you down, first using an elaborate death trap then later snaking his way into CADMUS, convincing them that he’s a threat after spinning his first failed attempt to kill Superman look like he was the victim and that Superman is a threat to humanity, forcing Superman on the run from the government, specifically Amanda Waller, and having a few characters origins adapted to fit into the CADMUS storyline, such as having Luthor create Metallo through CADMUS. Then have Waller commission the ultimate weapon to take down Superman, leading into a fight with Doomsday. After witnessing him going out of his way to keep the monster from harming civilians and nearly dying in the process as he’s pursued by the rampaging monster, putting the safety of innocent people ahead of his own convinces Waller that Luthor was wrong about Superman being a threat. However, Luthor doesn’t give up trying to turn the public against him, using the arrival of General Zod as a propaganda tool and having an employee at WLEX start to turn people against him, that employee being Gordon Godfrey. Then, when Braniac shows up specifically searching for Superman, that just fans the flames even more, blaming Superman for Braniac’s arrival and the destruction left in his wake. However, when you’re on board Braniac’s ship, as a last resort, he tells Superman how he knew of his existence, revealing that he got a message from Luthor using technology from Apocalypse to reach him. After defeating Braniac, Supermen takes the device with transmitted message from Luthor that was sent to Braniac and has to break into CADMUS, once again sceptical of his innocence, and deliver the device to Waller, but not before having to fight through the Suicide Squad including a new and improved Metallo, Live Wire, and inmates armed with kryptonite weapons built to take down Superman, with the lights in the building emitting red sun radiation, making the squad more of a threat. Then, when you get to Waller, battered and near death, you give her the device and tell him it was all Luthor, he’s been playing her the whole time, he’s been lying to everyone. Then you collapse. After, you wake up in STAR Labs under a yellow sun lamp that had been healing you, learning that you’ve been out for days. Once you awaken, you’re greeted by Emil Hamilton who delivers some distressing news. He had been analysing the device and found something else inside of it, what appeared to be an invasion plan orchestrated by Luthor, who foolishly believed the invasion would be solely to take out Superman and blamed on him, allowing Lex to be the hero and drive the small invasion force back using high tech weapons he designed using stolen parts stolen from his time with CADMUS. Although he immediately falls victim to his arrogance once the invasion starts.
After getting the news from Hamilton, Superman asks how long they have before the invasion begins. Hamilton tells him that unfortunately, it already has begun, flipping on a news station to show a shattered and badly beaten Lex Luthor in a crushed and ripped apart battle suit, desperately pleading to be spared like they promised they would upon their initial arrangement. That’s when you see an imposing figure step out of the smoke surrounding the battlefield, only showing his silhouette, telling Luthor in a deep and menacing voice that he intends to honor their agreement, and he’ll do so right now, telling him that he will most definitely be spared of the agony of a slow and painful death. That’s when you see Superman on the screen, rescuing Lex before Hamilton even realizes that he left the lab, and that’s when the final fight begins and you come face to face with the invading force, fighting your way through a seemingly endless onslaught of mindless drowns until you come across an old lady. A short cutscene is triggered as Superman tells the woman she needs to get to safety, it’s too dangerous their. Then she laughs and tells him that he’s right, but she’s not the one in danger. Then she calls out, “Darlings, it’s time to defend your deal old Granny.” That’s when the Furries fly out from the ruble and ash emerging through the hoard of parademons, that’s when the fight starts and you have to take down the Furries. Afterwards, an enraged Superman, seeing the death and chaos the invasion had brought forth grabs Granny’s hand that’s holding her weapon, crushes it, lifts her up and stares her in the face, demanding to know where her leader is, because it’s time to end this. That’s when Darkseid steps out from the smoke and backhands Superman through a nearby building. When he comes out, he says, “I guess that answers my question.” Then commands Darkseid to leave and stop this senseless destruction. Then Darkseid laughs and tells Superman that it was over before it began and that he can not be stopped. That’s when Superman launches towards him and you enter the final battle, the face off against Darkseid. Once you defeat him and drive him back to Apokalips, Luthor is arrested and personally taken in by Waller, as she arrives to confiscate any remaining Apokaliptain tech to lock up in a secure CADMUS research facility, to be studied at a later date. For now, she has more important things to worry about, like seeing that Luthor gets the punishment he deserves. Then the game ends with Superman having regained the public’s trust and flying off with a certain reporter for a private interview of sorts. Then, at the very end, the game closes with a scene taking place on Apokalips with Darkseid watching the whole thing. Then he says, “Enjoy your peace while you can Kryptonian, because this was only the beginning.” Then the screen fades to black and the credits role.
Then a post credits scene starts and we see Batman and Alfred in the Batcave, watching the news footage on the Batcomputer, with Bruce remarking to Alfred that Superman got lucky this time, but when Darkseid inevitably returns, he’ll come prepared now knowing his enemy and not underestimating him like he did this time. He says Superman got lucky this time, but when Darkseid inevitably returns, he’ll come back stronger and with a new, more personal sense of purpose, now having an enemy here on Earth, and that they’ll have to ready for when that happens. Alfred asks him what he intends to do when it happens. Then Batman simply replies, “I already have a plan.” Then we see his computer monitor with several windows of footage, each playing a different video, and they’re all depicting different superheroes in action with a phrase at the top of the monitor reading, “The Justice Protocol” setting up for a Justice League game to come later on. Maybe have a few other members get their own games first and tie them together into a shared universe. Ideally, the characters to get their own solo games tying in to the future Justice League game would be Wonder Woman, Aquaman, and the Flash, with the rest of the League introduced in aformentioned Justice League game.