Edited on 03/21/20:
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"-" = Speaking.
'-'= Thinking.
"-"= Attack.
This has elements of other anime in it, so if you don't like that, well too bad.
Last time on Dragon Ball Z...
In the far reaches of the north, an extraterrestrial ship housing the Saiyan warrior Raditz crashed onto the soil of planet Earth. Searching for someone called 'Kakarot' he checked the device on his face to locate the highest energy signal and left in that direction. The son of the Demon King, Piccolo, interrupted his search. After exchanging a few barbs, they began a fearsome clash that ended in Piccolo's favor. Just as he was about to end the Saiyan, the defenders of the earth: Son Goku, Krillin, Yamcha, Tien Shinhan, and Chiaotzu stopped him. As the others clashed with Piccolo, Chiaotzu foolishly fed Raditz on the healing Senzu beans...
Wastelands...
The effects of the Senzu made itself apparent immediately, as evidenced by the sharp spike of Raditz's ki. The Saiyan's missing body parts suddenly regrew in a flash, as all prior damage suddenly vanished. Chiaotzu tried to cover himself with a ki barrier, but the increase in power threw him back. Dust clouds formed around the Saiyan warrior as he stood up, while sparks of bio-electricity flashed around his body. Clenching his hands, it amazed him. The feeling of his power. Raditz tapped his Scouter as it beeped rapidly before stopping.
"Amazing! My BP! It's over 3,000... hehe, now let's see that Namekian call me pathetic!"
Chiaotzu looked on in shock at the strange man in front of him. When Chiaotzu and his friends had gotten to the wastelands, they couldn't sense the malicious intent of the warrior because of his ki feeling so weak. But now... Chiaotzu was feeling the full force of the ki and was visibly shaking. Raditz finally noticed Chiaotzu and his mouth twisted into a sickly grin.
"So, I guess I'm In your debt, huh?"
Raditz flashed towards the midget and reappeared in front of the Crane student. He loomed over the small human and cackled at Chiaotzu's fear. The doll-like human tried to stammer a few words out but was too afraid to even breathe. Raditz's arm shot out and grasped the mime's skull, making Chiaotzu scream.
"Lucky to you... I always pay my debts. One way or another!"
And then, with a flex of his muscles, Raditz caved in the human's skull in a gory explosion. Grinning, Raditz turned his head to the side, noticing the battle in the distance.
"Heh, time for a family reunion."
In a flash of aura, Raditz burst off into the direction of the clash.
Few Moments Prior...
Piccolo was begrudgingly having a hard time fighting against the earth's defenders. They were like gnats, always attacking then falling back. Cowards, he snorted. Although it pained him to admit this, their attacks were damaging him somewhat. That fight with Raditz must have taken more out of him than he thought.
"Well Son Goku, I didn't think you had it in you to be so cunning?! Attacking me behind my back? Smart…" Piccolo grinned as he blocked one of Krillin's punches. Grabbing the monk's arm, he shot him across the desert. Krillin's body hit a nearby rock pillar, sending it crashing to the ground.
Goku glared at the reborn Demon King.
"You shut up, Piccolo. I gave you a chance to change! And now you're just attacking an innocent man!"
Ah, so that's what's wrong, Piccolo realized. The idiot had thought he was attacking the Saiyan, which now that he thought about it was a reasonable conclusion to come too. Piccolo ducked under a punch from Yamcha and sent the human flying with a quick hook kick.
"You idiot, I didn't start that fight. He came into my territory! I was just minding my business, that guy got what he deserved!"
Goku looked surprised at that before a shout from the air distracted him. Looking up, Piccolo and Goku saw Tien in the air, holding his hands in a dangerous position. Goku widened his eyes at this.
"Tien! Don't do it! The Tri-Beam harms you!" Goku yelled in concern.
"It doesn't matter, Goku! If it means getting rid of this waste of space, then it's worth it!"
'I can't let him hit Piccolo with that! If he does that, Kami will die!' Goku's mind raced.
Piccolo made to move, before two rings of king wrapped around his body, trapping him. In the distance, Yamcha held his hands out, shaking with the pressure of holding Piccolo down. Sweat was pouring down the bandit's body in waves, but he held strong.
"Ki-Capture: Success!" Yamcha gritted out.
Tien nodded at Yamcha before golden ki formed out of his body. He readied his body as he aimed at Piccolo's still form. Goku raced towards the Crane student to stop him.
"TRI-BEA-"
Before Tien could call out his attack, a white blur sent him flying into the distance. Everyone had turned to see Raditz calmly floating, a smirk on his face. He noticed Goku and smiled.
"Well hello there, dear, brother. I see you've made yourself some friends? What's with the getup, though? Part of a gang?" Raditz said chidingly.
Goku looked confused before he pointed at himself.
"Are you talking to me?"
Raditz blanched.
"What the-! Of course, I'm talking to you, you buffoon! God, you're stupid! Did you fall on your head or something?" Raditz asked rhetorically.
"Whoa, how d'you know that?" Goku said with a surprised face.
Raditz smacked his face.
"Oh my god, I'm related to this," he whispered to himself.
Raditz then noticed Piccolo, and his frown turned into a snarl.
"So Namekian! Called me weak, huh! Let's change that notion," the Saiyan seethed.
Raditz looked closer at Piccolo and saw the Ki restrainers, and his eyes trailed to the shaking Yamcha. He scoffed and aimed his hand at the bandit. In an instant, he fired a pink blast of Ki at the Turtle student.
Yamcha, seeing his death, murmured a few words.
"Man, what the fu-"
The blast impacted him and eradicated everything behind him for a two hundred-mile radius. The blast kicked up an enormous amount of smoke. Goku fell to his knees in despair as Piccolo looked unfazed.
"Feh, annoyance!" Raditz grumbled.
'No, Yamcha!' Goku thought in anger.
"YAMCHA! You Bastard!"
They heard a shout in the distance, revealed to be Krillin, who was shaking angrily. The monk was unconscious for the past few minutes, but when he awoke he bore witness to Yamcha's death. Seeing one of his best friends die made him so angry! Lifting his right hand, Krillin poured all his Ki into the one attack, his anger adding to more of the ki. He had never tried this attack in battle, but he would do it now to avenge Yamcha.
Floating above his right hand, a swirling disc of golden ki sparked to life, looking dangerously sharp. Krillin grit his teeth as the attack stabilized. With a roar, Krillin launched the attack at the Saiyan with murderous intent.
"This is for Yamcha! DESTRUCTO DISK!"
Goku and Piccolo watched on in awe, sensing the potency of the attack. The attack soared at the Saiyan who casually dodged while the attack passed him, angering the monk even more. In his rage, something snapped in the monk. His eyes glowed a bright white and his incense marks did the same. Krillin yelled out as the Destructo disk suddenly turned a bright white and spun faster than ever. The attack suddenly expanded and sliced Raditz's tail off!
"AAAHHHGGH" the Saiyan screamed as he held the limp stump of his tail.
The temporary power boost suddenly left Krillin as the monk fell to the ground.
'Heh, least I did something for you Yamcha..' the Turtle student thought satisfied.
Goku looked at Krillin in shock. He would have never imagined something like this from the monk. Piccolo looked mildly impressed. Seems humans can do something, he thought sarcastically.
"RAAGH! Imma kill that bald maggot!" Raditz yelled. A sadistic gleam entered his eyes. He rushed towards Krillin, ready to rip his head off, but as he was almost there, he heard something that sounded suspiciously like… 'Kame-Kame-Ha'? Before he could comment on this, Raditz felt a searing pain on his side and blasted away because of a large blue ki beam. He impacted a rock spire and fell to the ground with a crash. As he stood up, he looked at the culprit.
Goku stood in front of Krillin, not willing to let any more of his friends die. Raditz boiled with apoplectic rage at the sight of this. How... dare he! Harm his flesh and blood for some creature of a backwater planet!
"Kakarot! You fucking traitor! How could even think of attacking me, YOUR BROTHER!" Raditz snarled.
Goku had a hard look on his face as he answered Raditz.
"I don't remember having a brother, and even if I had one… after all the things you've done? I wouldn't dare consider someone as disgusting as you related to me!" Goku bit out in a harsh tone.
This… right here was Raditz's breaking point. Hearing his brother disregard him like… like trash! It made him so boil in rage. The resemblance between Kakarot and his father only added fuel to the fire that was his rage. He gripped his head tightly as he rambled madly.
"I've… I've HAD IT! It's always the same! You and father! He always treated me like trash, and now you're doing the SAME! I.. I can't take it! I won't take it! Not… ANYMORE!"
With a deafening scream, Raditz powered up to his maximum. The pressure of his power caused hurricane winds to form around the desert, kicking up tons of sand. Goku braced himself as the winds tore at his skin.
"I… I can't take him on alone! It's hopeless!" Goku shouted to himself.
"Humph, Pathetic!"
Looking to the side, Goku saw Piccolo power up to his maximum. His emerald aura picking up its dust cloud.
"Giving up so easily, Son Goku! It seems I was wrong about you. You're just a spineless weakling! At least your friends fought with honor, but you…! Humph… disgusting!"
Goku suddenly became angry, but not at Piccolo. At himself! How could he give up like that! He needed to avenge Yamcha! Piccolo, seeing a spark light up in Goku's eyes, smirked.
"That's more like it! Now, to deal with this guy…"
The two fighters then turned to see Raditz glaring at the both of them. He seemed to have gone feral, as evidenced by the frothing of his mouth and his twitching form. He was growling like a beast.
"As much as it pains me to say this Son Goku… we need to fight together to defeat this guy."
Goku's eyebrow twitched in annoyance at this.
"Why should we? For all I know, as soon as we're done with this guy, you'll kill me when I'm weak."
Piccolo scoffed at the notion.
"You're not the main person I want to kill right now. It's that freak right there! However, as soon as we're done with him… you're dead meat!"
Goku lightly chuckled at Piccolo's reply.
"I expected that."
The duo soon fell silent as they both fell into their respective fighting stances. Goku with the turtle stance and Piccolo with the demon stance. As Raditz flew towards them, they prepared themselves for the fight incoming.