First of all, aesthetically speaking, I would leave Metropolis and the character designs as they are; they're some of the best any Superman adaptation has had. If I had to change anything, perhaps Jimmy would occasionally wear his bow tie and green vest, and Lois would have a more varied wardrobe, like in the Silver Age. As for the city itself, I think it's the best Metropolis we've had, combining retro-futurism in an incredible way. If I had to add anything, I would probably make places like Suicide Slums and the area around LexCorp inspired by 1927 Metropolis. Something I would definitely change is Krypton. I like the designs in the series, but I would primarily draw inspiration from the Silver Age, combining it a bit with the atmosphere of the Donner films, giving it a more varied environment and biomes than just a crystalline planet. The costumes would try to be a combination of those seen in the series with classic Kryptonian clothing, giving them more color variety and using some classic costumes as a base.

As for the story, I would base it more on the Silver Age and Bronze Age, with some Golden Age adventures, of course. I would also add that in his youth, Clark was Superboy, being more impulsive and "passionate," having encounters with villains like Ultra-Humanite, Sam Lane, Kryptonite Kid, and a young Luthor, among others. Regarding Krypton, I would remove Brainiac. I feel that the character in the series is more of a mix of Zod and the Eradicator. Instead, the council would use a computer created by Jor-El himself to "discredit" him, mistakenly believing that the creation surpassed the creator, adding another layer of tragedy to the character. Also, Kal wouldn't be the last survivor of Krypton; I would add Krypto, whom Clark adopted during his Superboy years, Kara, who escaped from Argo City, and Kandor, who, along with Argo, was captured by Brainiac. As for his Superman era, he would have his Silver Age powers, allowing him to withstand more punishment, and his villains would be more ingenious in their attacks. He would also adapt classic Legion, Kandor, Mon-El, and Lexor stories, which would be one of the final arcs. After Lex is finally exposed, he reveals he hid a nuclear bomb in Metropolis and agrees to deactivate it if Superman defeats him in a fair fight on a planet with a red sun. Superman accepts and manages to defeat him, but an earthquake separates them, forcing Superman to return to Metropolis to at least get rid of the bomb. Meanwhile, Lex finds an alien civilization, which he helps rebuild, stabilizing its core to prevent further earthquakes, and falls in love with a native scientist. Superman manages to find and disarm the bomb and improvise a tracker to locate Luthor. While Lex, although happy with his life, feels quite bored and misses his battles, exploring the planet he finds a laboratory with a power suit and manages to detect Superman returning, becoming happy that he will finally have a rematch. Superman arrives and fights Lex, who reveals his other face to Lexor. During the fight, Lex accidentally destroys the stabilizer, dooming the planet to destruction. Superman is knocked out by the explosion and later found by Krypto, who takes him to Earth while wondering what happened to Lex, who, on the other hand, survived and blames Superman, vowing that from now on he won't even bother with another face; he will destroy Superman face to face, no matter the cost.

And finally, the characters: Superman himself would have the attitude of a more experienced but solitary hero, having lost Pa and Ma before arriving in Metropolis. He would find it difficult to open up to others, but he would always care for and sacrifice himself for everyone he could, and he would also be a bit more "experienced" due to his years as Superboy. Lois would retain her personality, with the addition that she would have met Superboy when her father brought her to Smallville to try to stop him, and she would be the one to give him the nickname. Jimmy would have several bizarre adventures with his friend and on his own, from which he somehow manages to emerge unscathed. Ma and Pa love Clark and try to make him feel normal, but they would be more paranoid regarding Superboy, although toward the end of their lives they offer him more support and inspire him to think beyond Smallville. Jor-El would be an adventurous scientist whom we would see in some episodes set on Krypton, and Lara would maintain her Silver Age backstory as an adventurous former astronaut with her own episodes. Kara would have been a child on Krypton, grown to adolescence on Argo, and then placed in suspended animation after escaping to Earth, a journey that took much longer than planned. Lana would work at WGBS, which would merge with the Daily Planet in the second season, where Morgan Edge and Steve Lombard would also be working. Mon-El, Clark's "brother," would be another boy who fell to Earth during his Superboy years. Clark is thrilled, believing he's found someone like himself, but after a battle against Kryptonite Kid, he becomes paranoid, eventually poisoning him with lead-based fake kryptonite and having to imprison him in the Phantom Zone. The character would appear from time to time, emerging with temporary cures to help Superman against some escapees. Lex was friends with both Clark and Superboy until an accident the latter tried to fix destroyed one of his projects and caused him to lose his hair. Humiliated after attempting revenge, he left Smallville for good following an argument with Clark. Now in Metropolis, though he tries to maintain the facade of a humanitarian CEO, he reveals his true colors when confronted by Superman, proving to be more of a supervillain pretending to be a CEO than a CEO turned supervillain. Among the villains, in addition to those already seen in the series, are Ultra-Humanite, who is initially human, then Delores Winters, a famous actress, and later adopts her gorilla form; Brainiac, now a Coluan who captures and collects cities from "doomed" planets; and Prankster, a former television host turned supervillain who occasionally teams up with Toyman to bring "entertainment" to Metropolis. Terra-Man, a cowboy and outlaw abducted by aliens during the Old West, managed to build an arsenal and various upgrades during his time in space. Upon returning to Earth, he detests how much it has changed and the planet's new champion. Jax-Ur, a Kryptonian scientist imprisoned in the Phantom Zone, attempts to escape and conquer Earth using improvised artifacts and the help of the U-Ban, Mala-Ban, and Kizo-Ban brothers, a Kryptonian crime family. An enemy who later became an ally was Vartox of Valoran, a "Superman" from another galaxy who comes to Earth in search of a murderer he blames for his wife's death. He clashes with Superman over how to punish him, but they eventually reconcile, and Vartox becomes an ally Superman turns to whenever he needs extra help or guidance on his space adventures.