In Ohio, there’s a town called Dillford, famous for two things: its riblets, and the fact humans,
vampires, and zombies coexist in peace. Vampires are at the top of the social order while zombies
are second-class citizens, and humans are somewhere in the middle. On a Friday night,
Dag and Lorelei are running away from a horde of vampires as a huge explosion goes off behind
them. Another human is caught and immediately eaten while the teens have to dodge an incoming
police car in flames, this forces them to hide in a house nearby. Unfortunately this place is
packed with zombies, and at that moment, the vampires start breaking in by destroying doors
and windows. A vampire grabs Lorelei through the door and Dag has to quickly take her away while
a big fight ensues in the living room with dozens of monsters attacking each other. It doesn’t stop
until another police car crashes into the house, making a hole in the wall that reveals an alien
spaceship hovering above town. This whole mess starts at school the day before. Dag's telling
his best friend that he’ll finally get to sleep with the popular girl Lorelei, but the friend
immediately points out she’s only using him to stash her Mary Jane. Dag refuses to believe it,
but when they meet her later, Dag fails to get Lorelei’s attention. Meanwhile Petra is trying
to flirt Milan, a popular vampire. They're chatting about the upcoming vamp party when
they’re suddenly interrupted by Ned, who tries to access his locker behind them. Milan snarls
at Ned and pushes him away so a second vampire can hit him to the ground. Dag sees all this from afar
but walks away instead of helping. Afterward, Ned goes to see vampire teacher Keller, who spends his
time in the teacher’s lounge looking at dating sites. Ned wants to know why his essay got an F,
and after a very long rant, Keller admits the essay was good but he gave it an F because he
could. Later during lunch, Petra sits with her goth friends, who warn her about Milan's bad
reputation. Petra refuses to believe it, but at that moment they see him pushing and insulting Ned
again. The baseball team teases Chaz for having a loser like Ned as his brother while a zombie
girl helps Ned pick up his spilled food. Later during baseball practice, Dag is disappointed
to find Rick, the man who fired his mom from the riblet factory. He always makes fun of Dag for it
and today he does it again, enjoying how much it annoys him. When practice finally begins,
Rick and the coach notice Dag has great pitching skills, but he fails when he's under pressure.
Chaz steps up to the plate while insulting Dag and showing off for Loreley at the same time,
which makes Dag extra nervous. These nerves cause Dag to throw the ball straight at Chaz’s face,
knocking him down. While the coach and Rick rush to help a creaming Chaz, Lorelei is impressed by
Dag. In the evening at the vamp party, Petra and Milan are getting frisky in a trailer,
but Petra suddenly stops Milan when he tries to bite her neck. She thought they were here
only to get naughty, but Milan reveals that he’s already been with Lorelei and what he wants with
Petra is more special. Feeling flattered, Petra accepts to do it all. Meanwhile at Ned’s house,
his father Chaz Senior scolds Chaz for getting injured, saying he’s useless if he can’t play.
Ned tries to leave the table but he gets picked on for disliking riblets, even though Ned is actually
allergic to meat and those riblets are full of unnecessary chemicals like TXP. An argument ensues
and Ned flees to his room, but his parents follow him and learn Ned has dreams for the future.
They don’t think Ned is destined to succeed and advise him to settle for a less ambitious life,
which upsets Ned so much that he leaves the house. At Drag’s home, he tries to get frisky
with Lorelei, who is too busy smoking a blunt she had stashed under Dag's bed. Refusing to give up,
Dag tells Lorelei he’s in love with her, but Lorelei finds it amusing and excuses to
leave through the window. At that moment Dag’s parents come in and find the blunt on the bed,
thinking it belongs to Dag. They don’t believe him when he says it isn’t his, but they still are very
supportive. They also try to give him a talk about a huge body change he’ll go through soon, but Dag
thinks they’re talking about something naughty and bids them good night. Later that night, Ned goes
to watch the zombies in their humble neighborhood. He is approached by the zombie girl from lunch and
asks her some questions about zombie life because he’s amazed at how everyone gets along here. When
a twat drives by and throws something at the girl, she can’t even feel it, and Ned gets jealous of
the zombies' unfeeling nature, so he convinces the girl to bite his foot in order to get infected.
Then he joins a family during dinner and has his first bite of canned brains. Meanwhile Petra is
in her room feeling frustrated because Milan won’t answer her texts. The bite mark on her shoulder is
getting serious and when she looks in the mirror, she discovers she doesn’t have a reflection
anymore. Starting to feel hungry, she goes to a supermarket to buy blood products and when a
friend sees her, Petra hides everything from her and runs away in shame. Then she consumes the
blood where nobody can see her. Dag is also out of the house practicing baseball. At that moment,
all three teens notice a bright light coming from the sky and they look up to discover a huge alien
spaceship hovering above town. Soon pictures of the ship are appearing all over the news,
but nobody manages to see an actual alien. After a couple of days, Rick gathers the human community
at the high school gymnasium, and when Chaz Senior notices the vampires aren’t there, he suspects
they’ve already made alien contact. Meanwhile Keller gathers the vampires at the blood bank,
saying that humans may’ve already made contact with the aliens and are conspiring together to
eliminate the vampires. Petra is there too and tries to get Milan’s attention, but he ignores
her. Chaz Senior and Keller give their respective crowds big speeches about defending their people
until both groups agree to launch pre-emptive strikes on each other. In the meantime in the
zombie neighborhood, the zombies gather because the brain rations haven’t come today. Ned
explains that the town dwellers didn’t send the rations because they’re too busy dealing with the
aliens and they don’t actually care about zombies anyway. With a calmer yet still effective speech,
Ned rallies the zombies to get back at the other two groups and leads the group out of town. That
night at the town square, the three groups meet and an incredibly violent and bloody battle
ensues. The entire town begins killing each other with any object they can put their hands on, not
caring if they know anyone in the enemy team. Dag goes to his car and when he finds Lorelei there,
he tries to scold her for being careless, but as soon as she asks him to get frisky together,
Dag drives away to do it at home. Meanwhile Petra confronts Milan, demanding an explanation. When
she gets pushy, Milan pushes her against a wall and admits that he only seduced her to quench his
thirst. Furious, Petra tries to attack him, but Milan is faster and tosses her into a car before
leaving. At Dag’s house, he watches through the window how the neighborhood is descending into
chaos and fires are starting everywhere. Lorelei reminds him what they came here for, but when the
teens are about to score, a vampire dragging a human breaks through the door and makes a bloody
mess right there on the floor. Dag and Lorelei escape through the window and when they land on
the ground, an explosion goes off nearby and some vampires jump on them. Luckily Chaz Senior comes
to their rescue armed with wooden stakes. He stabs the vampire that attacked Lorelei, then proceeds
to fight the other vampires with amazing skill. Finally he kills the remaining vampires with such
strong hits that he creates a shower of blood. Then he proceeds to tell the teens about all the
training he went through in preparation for a day like this, but suddenly he’s surrounded by a bunch
of zombies, who slowly eat him while he’s still alive to feel it. At first the teens can’t help
watching in horror, but at that moment they are found by a horde of vampires, so they have to run
away, bringing the story back to the beginning. Chaz Senior dies but quickly comes back a zombie
too. Near the road, a furious Petra comes out of the forest and sees Lorelei running with Dag, so
she decides to join the vampires that chase them. After dodging the police car on fire, Dag and
Lorelei get inside the nearest house, where they find a cute little dog but also Ned with a group
of zombies. At that moment the vampires start breaking in and chaos ensues with the monsters
killing each other without mercy. Dag and Lorelei try to go upstairs, but Petra’s desperate for a
victim and jumps on Lorelei to bite her neck. At first Dag can only watch, but after a few seconds
he pushes Petra off the stairs, also falling himself in the process. When he lands on the
ground, Dag manages to find a sharp wooden object that he uses as a stake against another vampire.
Then tries to stab Petra too, but Ned tosses him away. Dag gets attacked by yet another vampire,
so he grabs a wooden fish ornament to kill him. Meanwhile a vampire pushes Ned to the ground,
but Ned bites his thumb off and spits it into the vampire's mouth. This causes the vampire
to stumble back, knocking Petra down just as a police car crashes through the house and runs him
over. Now the only ones left in the house are Dag, Petra, and Ned. Before they can attack each other,
they notice a bright light nearby and come outside to find the alien spaceship emitting
a smoke-like substance that covers the town. Out of this smoke comes a bunch of aliens,
destroying anything that gets in their way and using their tentacles to stab people. After a
moment of staring in shock, Dag starts knocking on a trapdoor, asking for his piano teacher Mrs
Miller. She’s indeed there with her son Stuart who begins asking a bunch of very ridiculous questions
to confirm Dag’s identity. Once Stuart is sure the teens are good guys, he opens the door and lets
them all in, although he’s worried about having a vampire and a zombie in his bunker. Dag promises
it’s fine and goes to shut the trapdoor, only to suddenly hear a scream. By the time he comes back,
he’s appalled to discover Petra and Ned are eating Stuart and Mrs Miller. Dag gets ready to fight,
but Petra convinces him to stick with them since it's the only way they can survive. Hours pass
and they try to chat for a while until Petra questions Dag's feelings for Lorelei, saying he
hesitated to save her. Dag denies this, but Petra points out that if he really cared about someone,
he would just jump right in to save them. At first Dag keeps Ned busy by distracting him with a laser
pointer, but as time passes, they realize that the longer Ned goes without eating brains, the more he
regains his intellect. Petra learns that Dag and Ned used to be friends, but Dag doesn’t explain
why they drifted apart. Then Dag starts to worry about his family and wants to go out to check on
them. When Petra reminds him of the alien threat, Dag says that they can starve Ned long enough for
him to come up with a plan to defeat the aliens. The next morning, the teens climb out of the
basement, only for Petra to immediately collapse under the sunlight. Dag quickly removes his
clothes to cover her, saving her just in time. At that moment the aliens show up, so the trio agrees
to split up and meet back at the school. When Dag tries to run away, he accidentally stumbles
into a clothesline and falls to the ground as an alien approaches him from behind. Moments later,
Petra and Ned make it to the school. Dag arrives shortly after still with no clothes on and he
tells Petra how the aliens ignored him on his way there. Ned theorizes that the aliens only
detect the inorganic matter in clothes, so not wearing anything should allow anyone to sneak
around the aliens without being noticed. Afterward they go to the cafeteria to have something to eat,
and Ned tells his friends he became a zombie on purpose. Dag gets very judgmental about Ned's
choice, but Ned remembers how Dag thought he was cool back in middle school. Embarrassed and angry,
Dag confesses that he admired Ned's hacking skills back then but didn't want to keep hanging out with
a loser, causing Ned to leave the room. Dag leaves as well and Petra goes looking for him, only to
find him sulking inside an empty boiler. They chat for a while and share their vulnerabilities,
causing Petra to cry for always feeling inferior to Lorelei. Dag comes closer to comfort her,
and suddenly they start to kiss and move into getting frisky. However Dag gets startled when
Petra kisses his neck, accusing her of trying to bite him. Petra is offended that he thinks she
would ever do that and goes away. In a classroom, Petra is looking through the window and notices
the aliens are moving closer as the boys join her. They agree they need to leave, so in order to be
safe, all three of them take off their clothes. As they walk the streets with nothing on, they
confirm Ned had been right and not a single alien comes after them. Suddenly it starts raining,
and the trio rushes to hide in Dag’s house. Dag is disappointed to discover there’s nobody in
the house, then he shares some clothes with his friends. Suddenly Dag hears a noise from a tv and
realizes he didn’t check the basement, so the trio runs downstairs. At that moment the power
goes out and an alien shows up, quickly capturing Ned with its tentacle. Dag immediately grabs Ned’s
hand and pulls him out of the alien's grasp, so the tentacle tries to stab Dag, but Ned jumps
in and receives the attack instead. Unfortunately Ned disintegrates at the same time Petra chops the
alien's head off, finally killing it. Afterward, Dag looks at a picture of him and Ned as kids as
he expresses all his guilt about how he never defended Ned against twats at school yet Ned
still sacrificed himself to save him. While Dag tells the story of a baseball game in which Ned
never got to prove himself, suddenly Ned shows up in one piece, and the trio reunites with glee. Ned
explains that the aliens teleport the people they stab with their tentacles, but since Petra killed
the one in the middle of the process, Ned ended up nearby. This means that all the citizens of
Dillford aren't dead but hidden away somewhere. Ned has also figured out that the aliens are
after the TXP in Rick's riblets, showing the gross allergic reaction he had from the alien's tentacle
as proof. The next morning, the trio goes to the riblet factory while wearing organic cotton so
they can’t be seen by the aliens. Rick only lets them come inside after making Dag admit something
embarrassing, and the trio explains the situation to him, saying he could be a hero. However Rick
refuses to help, saying that the crazy people from their town deserve to be abducted. An argument
is about to start but at that moment they hear screaming, and the group runs to discover Ned is
eating Rick’s girlfriend. Furious, Rick kicks the trio out. Luckily Dag comes up with a plan, which
begins with them getting the aliens’ attention and getting stabbed on purpose so they’re
teleported to where the people of Dillford are imprisoned. They suddenly show up in a superstore,
where they discover each species is separated by a force field. Milan catches Petra and immediately
attempts to drink blood from her, but she hits him in the gut as revenge. Ned manages
to reunite with his father and brother because they’re zombies now, and they apologize to him
and they reconcile. Dag finally finds his parents alive in the human section and discovers Lorelei
survived too, but she’s become a vampire because of Petra’s bite and she’s on the other side of
the force field. Luckily the field still allows them to communicate, so Dag and Petra find Ned
and encourage him to think of a way to bring down the force fields. Ned starts remembering the day
he hacked the school computers and made them show a dirty gif of two dogs, this memory makes
him realize they need to throw a DoS attack to overload and short out the security system. To do
so, they need every person in the room to hit all the force fields at the same time. People begin
arguing because they think only certain species should die, so Dag comes up with a heartful speech
to change their minds. However it isn’t until his dad starts chanting USA that everyone agrees
to help. All the citizens charge at the force fields at the same time, quickly shorting the
system out and destroying it. Then they run out of the building and rush to the riblet factory,
but Rick meets them with bullets. Once again, Dag talks to Rick with a heartfelt speech and makes
the crowd start chanting Rick’s name, this appeals to Rick’s ego and he finally opens the gates to
let them in. Unfortunately the smoke also follows them and soon there is a bunch of aliens coming
along. Rick immediately gets the aliens’ attention and guides them toward the vat of unprocessed
riblets. Then the huge aliens suddenly open up, revealing they’re just big machines and the actual
aliens are little creatures traveling inside them. All the little aliens dive into the vat until the
contents begin moving and a bright light suddenly blinds everyone for a second. When the people open
their eyes, they discover the little aliens have fused into a big glowing one. The alien proceeds
to explain that they came for the TXP peacefully, but then the town went crazy on their own so they
locked the citizens up to protect them from each other. Then the alien proceeds to quote Billy
Joel’s song to scold everyone for their behavior. Petra insults the alien for being condescending
and points out it was them who scared everyone in the first place, inspiring Rick to throw a
wrench at the creature. Furious, the alien begins attacking the crowd, hitting people with its huge
hands. As everyone runs away, Keller gets smashed into blood drops and Petra is knocked back,
accidentally dislodging an ammonia hose. The liquid starts to melt the giant alien and Dag
quickly gets people to grab more hoses and spray as much ammonia on the alien as possible. While
they work, Milan grabs Petra and throws her into a storage room. Dag sees this and remembers Petra's
words about hesitating, so he immediately jumps at Milan and starts a fight. Dag manages to throw
a couple of punches, but Milan is too strong and quickly overpowers him. At that moment,
the clouds move in the sky, revealing the full moon. The light touches Dag through the window
and suddenly his body starts changing into a more hairy shape - it turns out Dag is a werewolf,
and that’s the change his parents mentioned. With his new powers, Dag fights Milan again in a fair
match. After exchanging a few hits, Milan comes after Dag with a knife, but Dag dodges just in
time and Milan ends up impaled on a wooden spike, instantly exploding. Meanwhile the citizens use
enough ammonia to reduce the alien into a small wrinkly creature. Ned tries to capture it, but
the alien summons its spaceship to rescue it. Then the alien releases a sub-atomic fusion explosive
to decimate the town. Finally having the chance to prove his skills, Ned catches the ball-shaped
bomb and tosses it to Dag, who throws it back to the alien spaceship, making it explode. A few days
later, people are done rebuilding their town and students return to school. Dag’s a popular kid
now and Lorelei tries to flirt with him, but he turns her down to go to Petra instead. The new
couple leaves to get frisky under the bleachers while Ned bonds with Chaz and the zombie girl.