Friday the 13th (1980)

"They were warned...They are doomed...And on Friday the 13th, 'nothing will save them." - Tagline
Friday the 13th (1980) is the original film and the very first film of the historical film franchise of the Friday the 13th series.  This film is the starting point of the Friday the 13th series and is the beginning of what was to be a historical film in the horror franchise.  Camp Crystal Lake was the camp for young children and one year, a child drowned in the lake.  The following year, two camp counselors were murdered by an unknown person that was never found.  The camp attempted to reopen year after year, with the camp being sabotaged and never had it to reopen.  The camp finally reopens and there are new camp counselors that are working there, only to have their fate left in the hands of a mysterious killer, whom was later revealed.  The camp, now nicknamed, Camp Blood, has a curse, a death cursed, and each camp counselor has to find out this curse on their own when they disregard the warnings from the locals and have their fate sealed at this cursed camp.
Film infobox
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Friday the 13th (1980)
Directed by:Sean S. Cunningham
Produced by:Sean S. Cunningham
Written by:Victor Miller
Starring:Betsy PalmerAdrienne KingKevin BaconHarry CrosbyLaurie BartramJeannine TaylorMark NelsonRobbi MorganAri Lehman
Music by:Harry Manfredini
Cinematography:Barry Abrams
Editing by:Bill Freda
Studio:Georgetown Productions Inc.Sean S. Cunningham Films
Distributed by:Paramount Pictures
Release date:May 9, 1980
Running time:95 minutes
Country:United States
Language:English
Budget:$550,000
Box office:$39,700,000
Preceded by:N/A
Followed by:Friday the 13th Part 2
==Plot==
It all started in the summer of 1958 at a local summer camp for kids, Camp Crystal Lake. The kids are asleep and the counselors are having a campfire sing-along in one of the cabins. Two of the counselors, Barry and Claudette, sneak away from the group and enter another old cabin in order to make love. They go upstairs but before they can get very far, an unseen assailant murders them both with a hunting knife (Barry with a knife to the stomach and Claudette is presumably stabbed to death offscreen.
Due to the murders, the camp is closed down for the next twenty years. The film switches to twenty years later where the camp is being re-opened by Steve Christy. He hires a couple of counselors to help him clean the camp up for the kids, including Alice, Bill, Brenda, Marcie, Marcie's boyfriend Jack, Ned, and Annie, the camp cook. Alice, Bill, Brenda, Marcie, Jack, and Ned arrive at the camp and begin helping Steve with various tasks around the campgrounds.
Meanwhile, Annie is hitchhiking to the camp. She stops at a local diner to ask for directions, and acquires a lift halfway from a friendly truck driver named Enos. In the parking lot, an eccentric old man named Ralph stops Annie and warns her not to go to Crystal Lake. Enos shooes him away, helps Annie into his truck and drives away. On the way to the halfway point, Enos also warns Annie about Crystal Lake, telling her that twenty years ago a boy drowned and a year later, two counselors were murdered. Annie dismisses his warnings, and continues on to the camp. Enos drops her off and Annie gets another lift from a driver (who the audience does not see) in a Jeep. Annie tries to strike up a conversation, but the driver remains silent and not visible to us. Then, the driver drives past the entrance to Crystal Lake. Becoming increasingly anxious, Annie tries to get the driver to stop the car, but the driver drives even faster. Annie is forced to leap from the speeding vehicle, in which she hurts her ankle. The unseen driver stops, gets out of the car, and chases Annie into the woods. The chase doesn't last long, as the driver catches up to the terrified girl and slashes her throat with a hunting knife.
Back at the camp, Steve Christy goes into town to get supplies leaving the teenagers to finish up cleaning the camp. The counselors take a swim break, where Ned, who is an experienced prankster, decides to pretend to drown only to get a little  mouth-to-mouth from Brenda. Then, Alice returns to her cabin and finds a snake, and calls for Bill. Bill rushes in and kills the snake. Later, a police officer arrives and informs the kids about the town crazy, Ralph, and asks them to be on the look out for him. Then, after the officer leaves, while Alice is preparing for dinner in the main cabin, Crazy Ralph shows up and warns the teenagers to leave the camp and then leaves him.
As night begins to fall, Jack and Marcie go to take a walk around the lake, much to the chagrin of the lonely Ned, who watches them. Ned then sees a mysterious figure disappear into an old cabin and follows them in. A storm starts and it begins to rain heavily, so Jack and Marcie take shelter in the same old cabin and begin to make love in the bottom bunk of one of the cabin bunk beds. Unbeknownst to the lovers, Ned lies in the top bunk, dead from a slit throat.
Meanwhile, Bill, Alice, and Brenda play Strip Monopoly in the main cabin. Jack and Marcie finish sex and Marcie leaves to use the bathroom. Lying on the bottom bunk, blood from Ned's corpse drips down onto Jack, and before he can react, the killer shoves an arrow into his throat from underneath the bed, killing him. The killer then goes to the bathroom facility and murders Marcie by slamming an axe into her face.
On the way back from town, Steve Christy's car breaks down and he is given a lift by a police officer, Sgt. Tierney. The officer drops Steve off at the camp, and shortly after he leaves, Mr. Christy runs into the killer outside of the entrance, and is quickly dispatched with a knife to the stomach.
Back in the main cabin, Brenda remembers she left a window in her cabin open and heads for bed. In her cabin, Brenda hears a child-like voice calling for help. Brenda goes out into the rain to look for the source of the voice and stumbles onto the archery range. Soon after, Alice hears her terrified screams in the main cabin. Alice and Bill go to check on her and find her cabin empty, except for a blood-stained axe lying in her bed. Frightened, Alice and Bill search the camp for a way to escape, but all the cars do not work and the phone line has been cut.
They return to the main cabin and decide to wait until Mr. Christy returns. Alice falls asleep on the couch and Bill goes to check on the generator. Alice wakes up in the main cabin and goes to find Bill, and discovers him pinned to the door of the generator shed with multiple arrows, dead. Alice, in a state of shock and hysteria, runs back to the main cabin and barricades herself inside. Shortly afterwards, Brenda's dead body flies through the window. Alice, seeing headlights outside and thinking it is Steve's Jeep, runs out of the main cabin. But instead of running into Steve, she runs into a middle-aged woman who tells Alice her name is Mrs. Pamela Voorhees, an old friend of the Christies. Alice takes Mrs. Voorhees into the main cabin to show her the body, and Mrs. Voorhees comforts Alice.
But suddenly, Mrs. Voorhees's demeanor begins to change. She begins talking about a  boy who drowned twenty years ago. His name was Jason Voorhees, Mrs. Voorhees's son. Mrs. Voorhees begins saying how the counselors weren't watching him when he drowned and they were off making love while he drowned when they were supposed to be watching him. Mrs. Voorhees then pulls out a knife, and turns on Alice. Alice quickly discovers that Mrs. Voorhees is the killer, seeking vengeance for her son's death. Mrs. Voorhees comes at Alice with the knife, but Alice fends her off with a fireplace poker.
Alice flees from the main cabin, discovering Annie's and Steve Christy's corpses in the process. Alice runs to the boathouse and hides inside, where she arms herself with an unloaded shotgun. Before she can find the bullets, Mrs. Voorhees gains entry to the boathouse and attacks her. Alice manages to escape and runs back to the main cabin where she hides in the pantry and locks the door. Mrs. Voorhees quickly enters the cabin and finds her, hacking at the door with a machete.
Mrs. Voorhees breaks into the pantry and attacks Alice once more, but Alice manages to strike Mrs. Voorhees over the head with an iron skillet, rendering her unconscious. Alice stumbles down to the lake, where she sits peacefully on the shore. But Mrs. Voorhees appears, alive, and attacks Alice again. After a lengthy struggle on the lake, Alice manages to get her hands on the machete and decapitates Mrs. Voorhees with it.
With the mad woman finally dead, Alice climbs into a canoe and drifts off into the lake. The next morning, Alice finds herself in the canoe out in the middle of the lake. Everything is peaceful, and Alice is relieved that is over. But all of a sudden, the decaying corpse of Jason Voorhees, the boy who drowned years before, leaps out of the lake, grabs Alice and pulls her from the canoe and they disappear under the water. 
Alice wakes up in a  hospital with doctors and police officers surrounding her, who tell her that all of her fellow counselors are dead. Alice then asks about Jason, the boy who attacked her in the canoe, and asks them if they found him. The police officer informs Alice that they didn't find any boy. Alice then responds with, "Then he's still there,", foreshadowing a sequel. The last shot of the film is of the lake, quiet and peaceful, devoid of visitors. The lake has swallowed its secret.