I'll be starting with Raditz arriving on Earth with most of the chapter being a large summary of the time skip also since Raditz is hardly important I'll be making him more like the DBZA version then again some DBZA versions are better than the original so other characters may be inspired by that also in terms of power level's I list them next chapter.
Age 761 (Random farm)
As an old farmer was doing what all farmers do... Do you know a farm? a mysterious ship crash-landed nearby the first thought in the farmer's head was Oh boy I'm about to have myself a super baby! he then ran up to the ship excitedly however the space pod opened itself and out stepped a large adult clad with otherworldly armor and had long black spiky hair ok maybe not a baby but still will do the farmer thought then the alien stepped off the ship surprised there was life "The fuck is going on here am I on the right planet? You short fat creature where am I?" "Um, Earth sir why?" "Ok I guess Kakarot has not got round to it." the mysterious man mused to himself then the farmer said "Alright why did you land here boy?" the alien turned quickly scaring the farmer "Alright poor man do you know who you speaking to?" he didn't let him reply "I am the elite warrior Raditz of the Saiyan race!"' the elite part was a lie but he didn't know that "Hmm power level of 5? damn that's pathetic even for a weakling such as yourself now speaking to me compared to your poor man's clothes my space armor is far superior! as are my space boots and space scouter! Anyway, I must look for my brother Kakarot." he scanned his surroundings "Holy shit what is that power level my scouter just broke but it was higher than Frieza!" he pulled out another scouter. He sensed Mr Popo's power of course but no one knew that then he frowned "Definitely not Kakarot hmm over there power level 350 seems alright might be him." Then Raditz turned towards the farmer "By the way I'm here to genocide everyone on this planet with my brother so... you know run?" The farmer whipped out his shotgun "I ain't scared of some cosplaying weeb eat my shotgun bullets bitch boy!" the bullets bounced off Raditz smiled "How about you eat my space punch!" punching a hole through his chest.
Age 756 to Age 761 (OG - Z time skip its a summary so there won't be much dialogue also from now on I'll use more dialogue in general)
After the end of the 23rd world tournament, the gang celebrated their victory after which they continued their heroic duties but maintained their close friendship whilst Piccolo was training to get revenge also during that time the Green Lantern Corp members of Earth Hal Jordan and John Stewart returned mainly to stay on earth for a while since they had completed their missions though the developments on earth were a surprise to them during that time another threat came to Earth an alien monster known as Starro a powerful and gigantic starfish-like creature that can create smaller parasitic versions of itself its power was formidable (Its power level would be 3000 and yes everyone could barley hurt it) and as a result it had most of the league in its control however Superman Goku and Diana eventually forced it into a cold area weakening it significantly after Batman recommended it when he performed some tests on the parasites after which the "Star Conqueror" so it fled into space leaving a small baby of itself which was captured and named Jarro and became a friend of Batman's after the encounter they realized that having a organized crime fighting group would have made it all easier so the Justice League was formed the name based on how Demon king Piccolo illegalized the words Justice and Peace a while back the group had Batman Superman (He changed his name when he reached adulthood) Wonder Woman Martian Manhunter Green Arrow Black Canary Hawkgirl Hawkman Zatanna and Green Lantern (John Stewart) and the Z fighters also (Being the group in canon).
Beyond that Clark began to work at the Daily Planet and met Louis Lane the two began to become interested in one another and eventually formed a relationship also Goku and Diana eventually started dating got married and had a kid named Gohan in the time span Zatara also took up the mantle of Dr fate and now is another protector of Earth towards the end of the relative peacetime other than Starro's invasion Batman took in his first protege Dick Grayson who took up the mantle of Robin and their years were spent fighting crime from more mundane threats similar to Captain Cold and other such fiends while the Joker ruined many lives despite how weak he was he remained a dangerous threat even to the heavy hitters at times in terms of his mind games and tricks other than that they had trained and prepared to face any potential threats from powerful beings.
Age 761 (At Metropolis)
As Clark otherwise known as Superman saved a group of people from a major crash the public took pictures and shouted his super alias Superman as of now he grinned his classic grin "Thank you but it is merely my duty as one of Earth's heroes" sparking more admiration from die-hard fans as he left the scene he made his way towards the daily planet where he worked and did his job as a reporter with his friends Jimmy Olsten and Louis Lane the latter which was his girlfriend though they didn't know he was Superman "Why hello there Clark" Louis said smiling as Clark walked in hair messy and glasses wonky "Oh high Louis!" Clark ran up to her and hugged her getting a giggle out of her then Jimmy came in and said "Come on you two lovebirds let's get this show on the road!"
After work, Clark bid Louis farewell and walked away before changing back to Superman and flying around scouting for any trouble however as he looked around he saw a familiar black car waiting in a parking lot he landed next to it as a caped figure stepped out of the car "So Bruce what brings you here?" Clark asked curiously Batman frowned "Firstly we don't say our names in public secondly I'm here to tell you something important." Superman realized that neither Dick nor Jarro was here "Clearly considering your proteges are here." Batman nodded "You see a mysterious pod landed on a farm a day ago." Clark looked concerned "Any other clues?" "Well that's what has me concerned the lack of evidence is clear and whoever came wasn't friendly as the entire farm and surrounding paddocks were destroyed and the mystery man or thing has some experience it seems, left no obvious idea where he or she went and destroyed any evidence even if a bit overkill." Clark was now somewhat nervous if not for the pod he would have framed Piccolo but clearly, it was something else plus Piccolo liked showing off his random acts of terror despite hating interaction with anyone still confusing to this day he thought "Well what's the point of telling me?" He asked "Well considering you are our strongest right now it's important you know about threats plus they could show up right-" An explosion was heard in the distance "Now," Batman said dryly Clark nodded grimly and flew off to confront the threat while Batman called backup.
Age 761 (Mt Paozu)
"Alright, Diana I'm off to bed now that Gohan's asleep." Goku yawned "You coming?" Diana nodded "I'll be there soon just let me get something real quick." As Diana went to the kitchen she got a call from Batman "What's up Bruce?" Diana asked tiredly "Diana is Goku with you? both of you must come to Metropolis now!" Diana heard the familiar sounds of ki blasts and nodded her head grimly "Alright I'm coming" then she ran to their room and told Goku "Change of plan's Goku we have to go now!"
Age 761 (a few hours earlier)
Raditz flew around the nearby islands going to the nearest high power level and soon found the source of a tall green alien levitating above a waterfall the Namekian noticed him and frowned "The hell are you?" Piccolo grumbled, "I'm Raditz and I only have one question on where's Kakarot?" Piccolo frowned "I have no idea who that is and I frankly don't care." "I don't have time for your game Namekian!" Piccolo's eyebrows raised curiously "I'm a Demon not Namekian you buffoon!" Raditz scoffed "You don't even know your own race must be a defective one! but in case you're wondering your basically slug people." Piccolo scowled "Way to ruin my day asshole!" Piccolo then looked into his mind "Oh you meant Goku? Cause that must be the Kakarot you seek though him being an alien is interesting." Piccolo added then he looked at Raditz though as this world's future ruler, I can't have you blowing it up!" Piccolo charged at Raditz hitting him 3 times before Raditz scoffed "So be it slug man!" Then he phased out and clocked Piccolo in the jaw before hitting him with flurries of hits then sending him to the ground Raditz grinned "Your power level of 350 means nothing to me Namekian!" "The fuck you talking about?" Piccolo shouted Raditz hit him again knocking him to the ground "Never mind I'm out of here later weakling!" Raditz flew away making Piccolo clench his fist in anger "I the Demon king won't be embarrassed by a fucking monkey!" Before following him slowly to see what he does next.
Age 761 (Present day)
"I didn't expect this from a Krpytonian!" Raditz shouted with glee before phasing out hitting Clark hard in the back "But a power level of 450 won't save you from me!" then Superman hit him with eye beams surprising him "You are an interesting one I'll admit." added Raditz "But your death will be bittersweet under the heels of my space boots!" Clark frowned "You're not winning today Raditz!" then as he continued another voice said "Don't count me out yet!" and barreled into Raditz then turned revealing Goku Diana filed behind him then from another direction J'onn appeared to fight. Raditz frowned "400 410 and 430 respectively that'll be a pain." then a final fighter appeared the Namekian Piccolo. Diana groaned "Of course he shows up now!" then the group readied to fight but Piccolo scoffed "I'm helping you out ya dolt!" Then he turned "Raditz you'll pay for how you embarrassed me!" Raditz smirked "Whatever you say Namekian!" Then he turned to J'onn "A Martian how interesting." Martian Manhunter nodded calmly "I have scanned your mind and you'll pay for what you have done!" this got a cocky grin to show on Raditz's face "Like to see you try."
(Note Raditz's power has been buffed to 2500 so the fight is tougher.)
"The group slowly pushed Raditz away from Metropolis however the malicious fighter tried to bring it back there. Clark was weakened the most because he tried to hold him off before and so the rest tried to cover for him Diana quickly caught him in her lasso after they executed a plan J'onn telepathically told them about then they surrounded the Saiyan. "Raditz speak the truth for the lasso compels you why did you come to earth?" Raditz grinned "Well I came here to recruit Kakarot my brother to our cause!" he said pointing to Goku surprising everyone except J'onn and Piccolo Raditz then broke free and said "Kakarot you have failed your mission to exterminate life on this planet as the Saiyans wished you to but I'll give you a chance bring me one hundred bodies and I'll even spare your friend's lives! we are brothers after all!" Goku scowled "My friends are closer family than whatever you'll ever be!" Raditz scowled at this "Alright then your loss." Then he flew in the direction of Goku's house for some reason as they followed in pursuit J'onn said "Whatever he's planning we must stop him fast he'll be dangerous without anyone monitoring him." Clark frowned "Imprisoning him will be tough to pull off but hopefully possible." Piccolo scoffed "Then just kill him you damn pansie!" Diana scowled at him "We don't kill it's what defines the difference between warriors and killers it's not our right to dictate who lives or dies." Piccolo frowned "And it's his apparently? seriously this way of thinking is flawed on so many levels!" "Alright Raditz is the main focus right now guys," Goku said everyone went silent at that before they finally saw Goku's house appear into view where Raditz held Gohan in his hands, "Gohan no!" Diana yelled.
"Here's the deal chumps," Raditz said menacingly "You let me go or the child dies!" as Gohan cried Raditz knocked him out causing anger to spark from Goku "You monster!" Goku said angrily "Hurt us Raditz leave their child out of this!" Clark shouted J'onn nodded "There's a better way than this Raditz." Piccolo growled in frustration "See we should have killed him before but now look at the mess were in!" as Raditz threw Gohan on the floor he smirked I'm gonna kill you lot real good!" and charged in while the group dashed in also enraged and a brutal fight ensued as it continued Gohan woke up and saw Goku and Diana get hit with powerful blows "Leave my mummy and daddy alone!" Gohan shouted flying in power surging Raditz looked at his scouter surprised "2000 who is this kid!" before taking severe damage from a headbutt Gohan fell surprised on the floor as was everyone else "How did he do that?" Clark asked surprised everyone shook their heads as clueless as him however Raditz wasn't done while weakened to the point his power level would be only around 500 he raised his hand creating an artificial moon everyone looked confused until J'onn shouted "He's gonna transform!" and so he did Raditz became a great ape and bellowed "All you fools are is a mere zenkai boost to me now I'll take great pleasure in killing you and!" He then attacked with giant swipes J'onn attempted to fight as a giant dragon but was too weak to fight him back. Piccolo asked the group "I need five minutes to charge this attack can you hold out for me?" They all nodded grimly and fought Raditz luckily his size slowed him down a lot as they dodged his blows Diana drew her sword and charged at the tail before promptly slicing it de transforming Raditz just as Raditz grabbed Goku holding him out in front Piccolo unleashed his attack "Special beam cannon!" hitting both Goku and Raditz with the attack drilling into both killing them on the spot as Goku dropped Raditz said "My comrades they're far stronger than me they will avenge me in fact in a year they will come to kill you all!" before promptly falling next to him the two brothers still as stone.
As Diana shed tears and the rest of the group mourned in silence, Piccolo smirked Goku and Raditz were gone in one attack it couldn't have gone better but Piccolo was left dissatisfied killing Goku was an accident he wished to kill the Saiyan himself and apparently more Saiyan's are coming? he looked at Gohan and remembered his latent power after the display of the boy's strength he was obviously the key and he would use it for without Goku he would not be trained those softies would waste his potential but him? He could make him better so Piccolo grabbed the boy and flew away as the group chased him down J'onn asked telepathically "Why Piccolo why him?" Piccolo replied "I have no bad intentions I merely wish to mentor him and this is the only way." then he added reluctantly "I'm sorry." And he used the solar flare blinding them and escaping with Gohan for the foreseeable future.
Gohan and Piccolo's training will begin next chapter as will the main groups training for the Saiyan's arrival how will Goku go in otherworld? and how will Diana cope? Find out next time. and this is just the beginning of the Z era of the series.