- A newly-possessed high-school cheerleader turns into a succubus who specializes in killing her male classmates. Can her best friend put an end to the horror?
- Nerdy, reserved bookworm Needy Lesnicki, and arrogant, conceited cheerleader Jennifer Check are best friends, though they share little in common. They share even less in common when Jennifer mysteriously gains an appetite for human blood after a disastrous fire at a local bar. As Needy's male classmates are steadily killed in gruesome attacks, the young girl must uncover the truth behind her friend's transformation and find a way to stop the bloodthirsty rampage before it reaches her own boyfriend Chip.—The Massie Twins
- In Devil's Kettle, Minnesota, Needy Kesnicki is a shy teenage student that idolizes her cheerleader friend Jennifer Check, who is very arrogant. They attend a performance of the rock band Low Shoulder at a bar, and the band leader overhears that Jennifer is a virgin. When the place is set on fire, Jennifer is abducted by the band in their van. She later appears at Needy's home, covered in blood, throwing up a dark liquid and with a weird behavior. Over the next few days, many male classmates are found murdered with eaten parts of their bodies. Needy discovers that Jennifer was sacrificed by the band members in a black magic ritual, but something went wrong because Jennifer was not a virgin and she transformed into a flesh-eating succubus. Needy tries to keep her boyfriend Chip away from Jennifer.—Claudio Carvalho, Rio de Janeiro, Brazil
- Anita "Needy" Lesnicki (Amanda Seyfried), once an insecure teenager, is now a violent mental inmate who starts the story as a flashback while in solitary confinement. Needy is nicknamed "Kicker" in the asylum as she is notorious for kicking anyone from guards to doctors at the slightest provocation.
Needy used to stay in small town called Devil's Kettle, named after a waterfall. The water at the falls goes into a hole and doesn't come out. Needy and popular cheerleader Jennifer Check (Megan Fox) have been best friends since childhood, despite having little in common. Needy is a dork and Jennifer is Uber hot. Jennifer is a popular and beautiful high school color guard flag spinner. Jennifer often mistreats and dominates Needy, who is too in awe of her to stand up for herself. Needy is dating her boyfriend Chip and they are a completely normal couple.
One night, Jennifer takes Needy to a local dive bar to attend a concert by indie rock band Low Shoulder who has come in from the city. Jennifer had a crush on the lead singer Nikolai and made Needy cancel her date with Chip. The bar is really run down and serves all sorts of people with questionable backgrounds. Needy overhears Nikolai talking to his band member, trying to guess if Jennifer is a virgin. Needy confronts Nikolai and confirms that Jennifer is a virgin and stays that way by ignoring creeps like Nikolai.
A suspicious fire engulfs the bar, killing several people, and Jennifer agrees to leave with the band despite Needy's attempts to stop her. Later that evening, Jennifer, covered in blood, appears in Needy's kitchen and proceeds to eat food from the refrigerator. Unable to digest the matter, she vomits a trail of black, spiny fluid and almost bites Needy's neck and then leaves in a hurry as Needy calls after her. Jennifer is herself in no pain and all this while she smiles in a really evil way at Needy. Needy spends the entire night cleaning her kitchen floor.
The next morning at school, Jennifer appears fine and shrugs off Needy's concerns. While the small town is devastated by the 8 deaths caused by the fire, Jennifer seduces the school's football captain Jonas (Josh Emerson) in the woods and then attacks him while many animals in the woods gathered to watch. Jonas' disemboweled corpse is later found. Jennifer ends up taking a naked swim the lake deep inside the woods, after killing Jonas.
Meanwhile, Low Shoulder gains popularity due to their rumored heroism during the fire and offers to make a charity appearance at the school's spring formal.
A month later, Jennifer is beginning to look pale and accepts a date with school goth/punk Colin (Kyle Gallner), whom she brutally kills that night. While Needy and her boyfriend, Chip (Johnny Simmons) have sex, Needy senses something dreadful has happened and has a disturbing vision of a demonic Jennifer.
She leaves in a panic and almost runs over Jennifer, drenched in blood. After making it home unhurt, Needy finds a revitalized and amorous Jennifer in her bed. Jennifer attempts to seduce Needy by kissing her; Needy initially reciprocates but then comes to her senses and demands an explanation.
Jennifer explains that after the fire, Low Shoulder took her into the woods and offered her as a virgin sacrifice to Satan in exchange for fame and fortune.
However, although the sacrifice and greedy exchange were a success, Jennifer was not a virgin, and when the lead singer Nikolai (Adam Brody) murdered her, a demonic spirit took over her body. It is revealed then that Jennifer knew she needed human flesh and blood to survive. In addition to the known murdered townspeople, Jennifer also encountered the exchange student Ahmet (Aman Johal) after the fire and upon hearing that no one knew he had survived, she took him into the woods and ate him, making him her first victim. She had intended to eat Needy as well, but left because she could not bring herself to hurt her best friend. When she has eaten, she can withstand virtually any injury without pain, healing instantly.
The next day at school, as the town is stunned by Colin's death, Needy goes to the school library's occult section and surmises that Jennifer is a succubus; she is weakest when she is hungry and must eat flesh in order to sustain her life and appearance.
Needy tells Chip about her discoveries and warns him not to attend the dance. He does not believe her, and she subsequently breaks up with him in order to protect him. Chip goes to the dance, hoping to meet with Needy, but is instead intercepted by Jennifer, who seduces him and takes him to an abandoned pool house. Needy arrives there and finds Jennifer feeding on Chip. Needy tries to drown Jennifer but Jennifer, hovering in the air, attacks her. She is then stabbed by Chip with a pool skimmer. Jennifer escapes while Needy, heartbroken, watches her boyfriend die.
Needy then decides she must kill Jennifer. Angry and heartbroken, Needy breaks into Jennifer's bedroom. The two fight and Jennifer bites Needy's shoulder in the struggle. Needy rips Jennifer's best friend necklace off her neck. Jennifer stops fighting back and Needy stabs her in the heart with a utility knife, killing her and destroying the demon.
Jennifer's mother (Carrie Genzel) comes in and finds Needy with the utility knife on top of her daughter's body.
Soon after, Needy is brought to an asylum. Since she was scratched by Jennifer, she has obtained some of Jennifer's supernatural powers. Set upon revenge for what was done to Jennifer and herself, she escapes the mental facility and hitchhikes a ride to the hotel where Low Shoulder are staying; she then brutally murders them all.
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