Peter Mountain

Peter Mountain is the main protagonist villain of the August Underground trilogy. He is a vicious serial killer who takes pleasure in terrorizing, raping and killing random people.

August Underground
The film begins with Peter and his unnamed best friend torturing a woman he had kidnapped named Laura in his basement and also mutilating the corpse of Laura's boyfriend, Michael. The cameraman then proceeds to sexually abuse her, covering her face and genitals with urine and even feces. Sometime later, Peter and his friend are seen picking up an unnamed hitchhiker, after manipulating her into having sex with him, Peter brutally beats her to death while the cameraman films the whole act and laughs. Laura is seen again, being fed with one of Michael's toes, she dies shortly after due to her injuries. While travelling with his friend, Peter soon finds a potential victim, a defenseless old woman, she is murdered offscreen by Peter inside her own house. Next, the duo are seen stealing snacks from a supermarket, the clerk sees this and is stabbed by Peter, who then murders other two supermarket workers. Their next victims are two tattoo artists who happen to be twin brothers, Peter cuts off the older twin's leg with a hacksaw while he is still alive and smashes his head with a hammer, killing him. He then happily shows the body to the younger twin and kills him with the same hammer. In the next scene, Peter is shown having sex with the body of a dead prostitute, another prostitute sees this and tries to escape, panicking, the cameraman chases the prostitute, dropping and breaking the camera in the process.

August Underground's Mordum
Two years after the events of first film, the unnamed cameraman is missing for unknown reasons. Peter is now accompanied by his girlfriend Crusty and his brother-in-law Maggot. The film starts with Peter discovering Crusty having sex with her brother, visibly enraged by this, Crusty starts self-mutilating much to Peter's amusement. Hours later, Peter is seen beating a drug addict to death while Crusty films his death. Peter and Maggot are later shown masturbing as Crusty tortures and murders two women. After murdering more people, they visit a friend who happens to be another sadistic serial killer and child murderer. Peter is seen breaking into a couple's house and murdering everyone inside, Maggot is later seen practicing acts of necrophilia with the dead body of the couple's daughter. An argument starts between them and is followed by Maggot killing himself.

August Underground's Penance
Four years after Maggot's death, Peter continues to murder people with Crusty. After brutally murdering two men, Peter puts on a mask and breaks into a house and murders a couple and their daughter. After murdering several people, they kill a man with a hammer and Crusty drinks the blood of one Peter's victims. Sometime later, Peter murders a pregnant woman and cuts off the fetus out of her, realizing how much evil he is, Crusty becomes angry with him, resulting in Peter raping her. Remorseful of her actions, the film ends with Crusty killing herself.

Trivia

 * Judging by Peter's personality, he possibly killed the cameraman from the first film, explaining why he is not present in the sequels.