Disclaimer: based on characters created by Victor Miller. Apart from "Jason", all characters used here are mine.
Camp Crystal Lake, 1980:
During the summer, a group of youngsters were send to counsel the campgrounds. And with them, a group of children were dropped off. But during the weeks that the camping was taking place, not one parent had received word from their children, nor did anyone else receive anything from their own beloved in any shape or form. No letter, no phone-call, nothing. And when the bus was to return to the grounds to pick them up, neither the bus, the driver, or anyone he was supposed to be transporting, ever showed themselves. Naturally, it didn't take long before someone realized that something was terribly wrong with these campgrounds, and sent people to investigate. But when these people didn't return either, it was decided to take more extreme measures.
An entire team of experts was assembled to hunt down whatever it is that has kept people from returning. The team existed out of five people, armed to the teeth, and (as they like to call themselves) afraid of nothing. When all five of them arrive at the scene, their leader shortly briefed them about their objective.
"Alright." he spoke, "We know very little about the target, but what we do know is that nobody who came here ever returned alive. It is our job to find it and neutralize it. Any questions?"
One of them raised his hand, to which the leader nodded: "What if this guy Jason has something to do with all this?"
The remaining three laughed at that notion, but only one of them dared to ask: "You don't actually believe this, do you?"
"If that Jason is out there..." the leader replied, more serious than anyone else, "Then that means our target is human, and therefor there's nothing to fear."
Everyone fell silent after that, but someone else had another question: "Er... if it's human, wouldn't that mean we can't kill it?"
"Indeed it does." the leader replied, "Shoot to slow him down, kill him only when truly necessary. Any more?"
Everyone was silent, so the leader made his decision: "Good. Everyone move out!"
"Yes sir!" they all shouted in unison, after which they ran into the woods, looking for their target.
After five minutes, the leader decided they were deep enough into the woods, so he decided to contact them through his radio, one by one.
"Hicks, do you copy?" he called.
The one he called, Hicks, replied: "Yes sir."
"Did you find anything?" he asked.
"An old car-wreck. Though it looks as though a wild animal tore it's way in." Hicks answered, "Probably a bear."
"Funny you should say that." somebody else called over the radio.
"Is that you, Jackson?" the leader asked that voice.
"Yes sir." Jackson confirmed.
"Why is that so funny?" Hicks asked.
"I just found the remains of a bear here." Jackson told them, "It looks like something did quite a number on him. You'd almost feel..."
That's when Jackson heard a sound, which got him to instinctively hide behind a bush.
The leader was concerned about this sudden ending: "Jackson, what's hap..."
Jackson interrupted him: "Requesting radio-silence."
Jackson looked in front of him. He saw a man, much taller than he, Jackson, is himself, or the rest of his team for that matter. Because he only saw a shadow, he couldn't be too sure, but it looked as though this man held some kind of sword in his hands, and wore a mask.
Having seen him, Jackson turned away from the man, only to speak to his boss: "Sir. I've found the target. It looks like you were right, it's just a man."
"Good." the leader said, "Keep your eyes on him, we're coming over. Where are you?"
Hearing his boss's order, he turned his head back to the target, while saying: "I'm at the hi..."
He didn't finish his sentence, as the man he saw had disappeared. Wondering where he went, Jackson heard a branch snap. He turned around, shining his gun's light on the dark woods. Or so he thought, as instead there was the man he saw before, wearing a hockey mask and raising his machete.
"Jackson, I didn't read that." his boss kept saying over the radio, "Where are you?"
Instead of answering, Jackson tried to fight the masked man. He raised a fist, which caught the blow from the man's machete. In doing so, the machete has cut through Jackson's fist, causing him to scream of agony. Out of reflex, he dropped his gun. The masked man saw the gun, picked it up, tried to use it, but it was too sophisticated for him to understand how to use it. This is where Jackson saw an opening. He kicked the masked man's legs, punched him in the belly,... only so that the man decided to shove the gun into Jackson's throat.