Kill Theory is a 2009 horror-thriller film directed by Chris Moore in his directorial debut and written by Kelly C.

Meanwhile, Brent (Teddy Dunn) is travelling to his father's lakehouse with his girlfriend Amber (Ryanne Duzich), other couples Michael (Patrick Flueger) and Jennifer (Agnes Bruckner), Carlos (Theo Rossi) and Nicole (Steffi Wickens), as well as their friend Freddy (Daniel Franzese).

Upon arriving they are surprised to find Brent's step-sister Alex (Taryn Manning) has been living there.

After turning on the TV, the group view a video of Nicole being handed a loaded gun and told to shoot Carlos in order to survive.

The unnamed man quickly shoots rigged balloons of gasoline which spill over the van before telling the group that there is no escape and that they need to sacrifice one person in the next 60 seconds or they will all be burned alive.

The group panic; Brent deserts Amber by running into the forest, leaving her to return to the house with Michael, Jennifer and Freddy.

He quickly returns to the house and convinces Freddy to get the gun off of Michael by lying to him saying that they could both escape on the boat.

Realizing it is nearly 6 a.m. and the killer is approaching the house, Michael and Jennifer escape into the basement with an unconscious Amber.

In the basement they hide and attempt to shoot the killer when he comes downstairs, however it is revealed to be Alex, having survived her attack from Brent earlier.

Alex quickly dies from the gunshot wound before Jennifer turns on Michael in desperation, stabbing him in the stomach.

The killer leaves a voice mail in the psychiatrist's office, saying he's proved his theory that desperate people would resort to murder and the camera pans along a photograph to reveal Brent was the doctor's son.