A saiyan in Equestria?

This was the day, an apocalypse was going to happen and it's up to Ato, Dash, and a couple of knights to stop it, it was practically mission impossible.

In the morning, everyone's spirits were up, blissfully unaware of what was going to happen that night. Ato had decided not to train that day to save his strength for the fierce battle coming. He decided to actually look around town that day,since he hadn't actually been to anywhere else but the butcher, and to keep his mind off that night.

Ato couldn't eat unhealthy foods, which eliminated the bakery, he can't read or write, eliminating the libraries, and he wasn't hungry in general, eliminating the farmers market. So in a sense, trying to keep his mind off the invasion was impossible.

Later in the afternoon, Celestia had summoned the Equestrian force to sort out an attack plan.

"So, Nightmare Moon will be releasing her troops in town square at 10:00 PM, though there may be thousands of Dark Elves, they can't take much punishment, so really they're only dangerous if they attack at once. Once they've all perished, Nightmare Moon herself will come at you, the elements will be used as a last resort, so try your best to hold out as long as possible." explained Celestia

"But what about Luna?" a solider asked

"Luna? Once Nightmare Moon senses that her body is useless, she'll flee, besides Luna is an alicorn, therefore she is immortal." said Celestia

"You mean Nightmare Moon will just escape, using Luna's body as a vessel each time she recovers?" said Ato frustrated

"It's unfortunate, but we haven't found a way to completely vanquish Nightmare Moon yet." said Celestia just as irritated

"No sense in whining about something that can't be changed" Ato thought, still, the thought still bothered him, a foe that just won't die, Ato thought it was pretty pointless to continue to battle a foe who will will outlive him, and continue to wreak havoc and murder the innocent long after he was dead. "There's gotta be a way." he thought

Sunset was dawning on Equestria, it was the final hour before the invasion, Ato admired the sunset, wondering if it would be his last. Dash approached him and said "Listen, I know you're really, really, nervous about this invasion, and I just want to remind you, that I got your back."

"Hey, don't worry about me. You should watch out for your friends." he replied

"Well, your my friend, right?" she asked

"Yeah." said Ato

"Then I'll watch out for you, that's what friends do!" said Dash with care

"Well, I got to go the front lines, it's almost night." said Ato

"I'll catch up with you later!" said Dash

The sun was still barely hanging in the sky, Ato and the Equestrian forces were lined up, ready for the waves upon waves of dark elves.

The sun was no longer visible, now the only thing in the sky was the ominous bright-orange moon.

"Equestria! Tonight is the night when you shall crumble and bow to Nightmare Moon! Minions, attack!" a voice boomed from the sky

And then, as if they had had just appeared from thin air, dark elves surrounded the Equestrian force.

"Well men, we've found our punching bags for the night, are you ready?" cried Ato

"Sir, yes sir!" the Equestrian force yelled

Ato charged towards the horde of Dark Elves with no letup, and thus began the battle.

Ten seconds into the battle, Ato had already killed 15 Dark Elves with a barrage of swift punches and kicks, they piled up onto him, but there was no struggle Ato forced them away a single ki wave, the rest of the Equestrian forces were doing fine as well.

"Bang, Bang, Bang!" Ato fired rapid bursts of explosive ki, killing five Dark Elves at once with each shot. Ato was genuinely surprised to see how easily the Dark Elves were going down.

The Equestrian forces were very versatile in terms of combat, even if there were only six of them besides Ato, the pegasi did areial attacks, the unicorns fired magic at a distance, and the Earth ponies used their hooves to fight their way through the mob.

Though it seemed they were winning, stamina was getting low among the Equestrian forces.

"Sir, there's too many of them!" a solider cried

"Well that's a shocker, endure, soliders, endure!" said Ato

"Troops, clear the area, I'm going to do something dangerous." said Ato hesitantly

"But Ato sir-" a solider began

"Are you disobeying an order from your commander?" questioned Ato

Reluctantly, the rest of the Equestrian forces backed away from Ato.

"Well, I'm going to have to borrow this one from the royal family." said Ato

Ato extended his arm, sticking out his palm

"This is how you show saiyan pride! Dark Elves, meet something I'd like to call "Big Bang Attack!"" said Ato

The attack itself was blinding, and all that remained afterwards was a crater, smoking remains of Dark Elves, and the Equestrian forces.

From the sky, a silhouetted figure descended to the ground

"Well, well, well, you've killed all the Dark Elves, but that was child's play. I'm the strongest mare on the planet, you are but a fool if you wish to challenge me." said Nightmare Moon spitefully

"Well, then." Ato emerged from the shadows "It's a good thing I'm not a mare." he said