Wake up, he was starting to get back consciousness, he did not know what had happened to him but he assume it was probably something bad, fainting like that wasn't normal, not to mention the voice suddenly ringing inside his head, wake up it said, "what the hell?" Jack muttered, and then it spoke again-

Wake up, Now that he heard it clearly, the voice was rather raspy, quite gravelly even, but he still did not know where it had come from, all he knew is that it is telling him to wake up, it took some time but it once again spoke, louder this time-

Wake up! it yelled, prompting Jack to scratch his head in defeat, "Where the hell?" He asked, and it answered- I am inside of you Jack, the voice said, "You must be kidding..." He said, surprised and rather pleased, it was weird enough as is, but he guessed it was just some sort of prank, he is probably gonna turn around and he will see the person who did this and-

There was nothing,

But a wall,

"What the fuck?" He muttered, how the hell could this all possibly happen? He asked himself, "Alright," He said, putting his arms up in defeat, "Show yourself," he said, and the voice spoke once again, Here, it replied, and Jack looked around, nothing was unusual except-

"OK WHAT THE FUCK!"

- his arms, which by now had suddenly turned yellowish-green, "Am I infected with something?" In horror, he thought out loud, and once again someone answered,

No. That is me. The voice once again said, and following that his arms had gotten sharp claws, something that he was further surprised about, "Ok what the fuck are you?" He asked, "And why are you in me," He has believed that story now, with his arms suddenly becoming a clawed gauntlet and all that. The voice answered once again,

I am a Klyntar, an alien species that came from a planet far from this world, I do not know what my purpose here is but I do know that I am a symbiote, something capable of getting mixed up with your species, a mixup that would result in greater things.

"Funny," Jack said, what a term, he thought to himself, "Now remove yourself from my hand." He demanded, and the creature inside of him obliged, his hand suddenly became normal, the second skin that grew on top of it slowly shrunk to nothingness, well, he guessed that the proper term should be it retreating back into his skin.
"What the fuck?" He once again said, it was still a surprise, he did not know what to do with his current situation, does he tell the authorities? Does he sit back and ask what the hell does the creature want? He did not know, "Though I guess telling someone about you is probably a bad idea, not unless you can somehow leave my body," He said to the symbiote,

Unfortunately, I can't, the creature replied, I am stuck with you forever,

"So, for how long do you live anyways?" He asked, curious as for whether or not it is actually forever, it is just such a long time, that even he would be hard-pressed to believe it,

Thousands of years, why?

"Take a guess." Jack said with contempt, guess he would die before this parasite for his actually perishes, how sad. "So, what do you want from me, is there anything in particular?" He once again asked, if his situation is like this anyways, he might as well ask what is up,

Hide me, and I will grant you superhuman capabilities. The creature replied, that was something he did not expect, guess it knew what humans were, how neat! Still,

"Superhuman capabilities?" Jack asked, his tone higher than before,

Yes... I am capable of increasing your metabolism, regenerate your wounds in quick succession, and more importantly, grant you super strength, and worry not, your body would be able to handle it, after all, I am here.

Guess there goes his concern for his superhuman capabilities needing to obey the laws of physics, he guessed that it would probably be the symbiotes doing should he survive a punch that he released, he wasn't a genius or anything, but he knew that punching a wall would probably damage his own body. He guessed that the symbiote would neutralize that damage, "Enough of that, how did you find me anyways? Did you what, just stuck to the ceiling until you found someone or something? He asked, "Can you even survive outside of my body?" He added,

For one, yes, I have indeed stuck to that ceiling for some time now, I have possessed several people and they all died within seconds of being influenced by me, I have decided to remove my traces by eating them, you are the only one who has survived this long. And second, yes indeed, I can survive outside of your body,

"Damn, that is dark." Jack muttered, knowing that the creature inside of him did not care for human life was a bad thing but him turning into a lab rat was even worse, at least in this situation he is able to become superhuman, something he never guessed would happen when he saw that mutants started popping up everywhere. Lucky him he guessed,

"So, what now?" He asked, a smile on his face,

We become partners. That was the symbiotes reply,