(I don't own Shingeki no Kyojin.)
A program, established and lead by Grisha Jaeger, in which experimentation was the sole purpose among every single scientist that worked there. Grisha, who'd suffered through a dark childhood of corrupt human beings and war, set out to create a weapon to serve human kind, which had caused many problems for them in the past, but could be of use to human kind now, if controlled well. This project in which the test subject can use strategy and intelligence to breach the defenses of the opposing side.
This project was dubbed 'The Titan Recreation Project.
Everything seemed to be working well, cells in check, and test subjects showing little to no recoil to these. When awake, they showed great deals of intelligence and awareness as to what their sole purpose in this world was.
Grisha never settled for this. He felt it in his gut that everything would take a turn for the worse, for no experiment goes as well as this when it's as risky as it is.
Without the help or knowledge of any other of his workers, he created a similar concoction of the serum the test subjects were dosed with in the beginning. Later, he kept it in storage for future use.
Grisha's gut feelings were never usually wrong.
Today would be a change in fate, he thought. He tried to convince himself that he was overreacting, that everything was fine. Just in case, he grabbed the serum he kept in storage.
He didn't know why he felt as nervous as he did.
Then it happened.
One of the test subjects, of which there were nine, went on a sudden rampage, teeth sharpening and bodies distorting in ways. Their skin turned a sickly shade of an abnormal pink, and Grisha felt his heart fall in his stomach after this.
He had to keep the serum safe, he had to.
Grisha managed to go on lockdown, abandoning the place after they'd gathered enough things to continue research in the future, and keeping the monsters locked away for eternity.
He hoped.
Though, this would take a toll on the team. The government's funds began to dwindle, almost to a stop but not quite. Test subjects were nearly impossible to access.
Desperate times call for desperate measures, he'd thought bitterly when he'd injected his screaming 12 year old son with the serum he'd managed to preserve, before his son had passed out.
Said boy wouldn't see the light of day in a long time.
High pitched screaming from many filled the air as the warning siren sounded loudly, indicating that something went wrong in the place. The other test subjects from before managed to find the scientists, and slaughtered most of them with no remorse.
Very few escaped.
The lab was dimly lit, the only light being the phosphorescent green that emitted from a large capsul, holding a naked 18 year old male in a strange liquid. A filigree of tubes were connected to him in many places, helping him breathe while the liquid nourished him in many ways. Sparks appeared from broken wires, varying in seconds, reflecting in the blood that was spread all over the floor. Growling was apparent as the subjects crossed the floor, snarling as foam and blood dripped from shark-like teeth at the new smell.
One of them suddenly flinched.
There was a shatter as the capsul broke, due to the lack of machines that should have been on.
The monsters had managed to wreck the electricity supply.
Green eyes, almost the same color of the liquid he'd been in, glowed ominously as the orbs focused on the forms in front of them.
The man was kneeling, glass impaling his skin in many places, but after a few mere seconds a small bit of steam, he'd healed instantly.
His expression apathetic, he stood up and stretched. The creatures, who'd lost their minds long before now, sniffed the air, flinched slightly at the sudden action before their growling grew higher in volume.
One of them lunged forward, and all h3ll broke loose.
The man had simply kicked the first one in the head, and it appeared that he did so gently, but was proven otherwise to the others went that one's head went flying off in another direction. The object hit the wall and fell to the floor with a splat, joined not long after by the dull thud of the body hitting the floor.
He turned his attention back to the rest, whom faltered slightly, but didn't take the death of one of their own lightly.
The man only thought about how pitiful they all looked before killing them.
The scientists slowly leaked back into the dark lab a few hours into the future, flashlights in hand, and the gasp of one of them was audible as a shaky finger pointed to the broken capsul. "He... subject number... he's gone!"
Now, this wasn't all.
What really stunned them all were the many bodies that were not of their comrade's, laying on the floor, brutally murdered with what seemed one hit each.
They didn't know what to think.
Grisha made his way into the lab behind them, stepping over dead bodies and glass, the faint splash of his boot hitting blood was faint. He gasped as well.
"He..." Grisha trailed off.
"What do we do, sir?" One of them asked, while the others searched the lab for any evidence of where the man went.
"We have to find him. Do you know what this means?" He asked.
"What?" Another voice, belonging to a specticled woman with crazy brown hair put into a high pony tail, pitched in.
"It means that my serum worked." He spoke with no hesitation.
"Serum?" The same voice questioned.
"I knew something like this was going to happen." Grisha had made it sound like no deal.
"What do you mean you knew this was going to happen? I presume you did this on purpose, then?" She asked, voice still shaky from seeing her life flash before her eyes just hours ago.
"Calm down, Dr. Hanji. I didn't do anything on purpose. But those test subjects no doubtedly recall our scent, and there's no way of telling if they need to eat to survive. No there's no way of telling anything."
"You mean... Eren killed them?" She questioned and he turned to her, pushing his glasses up, which had fallen down the bridge of his nose, and spoke again.
"Precisely. And the fact that they didn't allow him to join them, and attacked first, means... It worked."
"That's not good." Hanji pinched her chin between two fingers, thinking about the situation.
"If we can find Eren before anyone else does and keep everything a secret from the public, then we'll have something to present to the government."
"All we can do is pray no one else finds him first." Hanji agreed.
(I don't know where this came from.)