It seems as though there's a problem. You aren't tuned in to the right timeline. Still, it seems interesting...
Superman watched and took a step back as Goku fell to the ground in front of him. They were both already pretty beaten, though he felt bad for Goku. The Saiyan was a little behind in terms of power, compared to the other two. Superman looked back up and noted that Shaggy didn't have a scratch on him.
"Come on, guys," Shaggy said with a sigh. "Like, I expected the strongest warriors in the Universe to make me use more that 12% of my power."
Gritting his teeth, Superman looked down at his clenched fists before shouting up at the unstoppable hippie. "Stand down, Shaggy!" From the edge of his peripheral vision, he could see Goku struggle to get up, mumbling something about Senzu beans. "You've gotten out of control!"
"I don't know what you mean, man." A smirk came across Shaggy's face. "I'm perfectly in control."
Seeing him fly towards them, Superman quickly grabbed Goku and jumped out of the way, barely missing it and watching as Shaggy instead created a giant crater. Superman was glad that Goku decided to take them all to this barren wasteland. IN an attempt to fight back while holding Goku, he tried to hit Shaggy with his laser eyes, but the man disappeared, and a moment later, Superman was launched to the side from the force of Shaggy's kick. He was moving too fast for even the superhero to keep track, and that shouldn't have been possible! This... hippie shouldn't be more powerful than Superman. No one should.
He looked at Goku, who was reaching into his sash. Once more gritting his teeth, Superman said, "Son Goku... This is not the time!"
Instead of acknowledging that, Goku pilled out a brown bag, and from that bag he pulled out a green bean, popping it into his mouth. He suddenly seemed at his peak, standing up easily and rolling his shoulders as he smiled. "Much better...!"
Before any could dwell on Goku's sudden recovery, Shaggy teleported in front of him and snatched the bag from him. "Like, thanks, man. I was feeling a little hungry." He then proceeded to tip the bag's contents into his mouth, eating the remaining 5 beans.
"No!" Goku shouted, horrified at the act. In sudden anger, he tackled Shaggy and got him off his feet, but Shaggy grabbed Goku, rode the momentum, and backwards somersaulted to land on his feet, throwing Universe 7's strongest behind him.
With a chuckle, Shaggy looked at Superman and said, "Those beans like, really hit the spot! I feel like I'm back at 1%."
Trying to fight back his anger, Superman charged at Shaggy, and he noticed that Goku was doing the same thing. However, instead of being able to land a hit on him, the two heroes were grabbed by the throat and lifted into the air as Shaggy himself flew a few feet up. "Pathetic, guys." No matter how much clawing and kicking the heroes did, they couldn't get free of Shaggy's grip. "Is this the best defense the Universe has?" He shook his head and tossed the two to the ground, leaving them gasping. "Oh well. Hey Scoob! Let's like, go get a burger first!"
His dog, ever the faithful companion, came running up to the omnipotent hippie, suggesting in that weird voice of his that they go to Spacey's.
"Nahy, man. Space McDonalds."
"Both!" Scooby chimed, and they left Superman and Goku to their failure.

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Shenron Academy (Reader Insert)
FanfictionWelcome to Shenron Academy, the school you've always gone to. The school you've always hated. Narcissist, loud, and stubborn, you begrudgingly attend Shenron Academy and try to make it through the struggles of life. It isn't made easy when that idio...