Set fifteen years after the original film, The Exorcist III centers around the philosophical Lieutenant William F. Kinderman who is investigating a baffling series of murders around Georgetown that all contain the hallmarks of The Gemini, a deceased serial killer. It eventually leads him to a catatonic patient in a psychiatric hospital who has recently started to speak, claiming he is the The Gemini and detailing the murders, but bears a striking resemblance to Father Damien Karras.
Prot is a patient at a mental hospital who claims to be from a far away Planet. His psychiatrist tries to help him, only to begin to doubt his own explanations.
When an innocent young girl finds herself befriended by two sexy, uninhibited girls at a small-town bar, she discovers that they have more planned than just a party-and she's central to the action.
There is something horribly wrong with the bodies found in the dark city streets. Some are mutilated while others have the Price equation (wΔz = Cov (w,z) = βwzVz) carved into their flesh. Detective Eddie Argo and his new partner Helen Westcott unearth the meaning of the odd equation and realise each victim is being offered a gruesome choice: kill your loved ones, or be killed. Before long it becomes clear that the perpetrator has suffered a similar fate and is now coping by seeking a way to solve this philosophical dilemma.
FBI agent Joel Campbell, burnt-out and shell-shocked after years spent chasing serial killers, flees L.A. to begin a new life for himself in Chicago. But five months later, Joel's best laid plans are abruptly cut short when his new hometown becomes the setting for some particularly gruesome murders--murders that could only have been committed by one man: David Allen Griffin. One of Joel's most elusive and cunning nemeses, Griffin has followed his former pursuer to Chicago in order to play a sadistic game of cat and mouse. Taunting Joel with photographs of his intended victims and leaving his crime scenes meticulously free of clues in order to keep the police at bay, Griffin derives as much pleasure out of watching Joel react to every movement as watching his victims die. But when Griffin moves into Joel's inner circle, Joel must quickly find some way to stop him before someone close to him becomes the next one to die.
When the local FBI office receives a letter from a terrorist known only as 'The Citizen', it's quickly determined that he's planning his next act at the Miss America beauty pageant. Because tough-as-nails Gracie Hart is the only female Agent at the office, she's chosen to go undercover as the contestant from New Jersey.
A recently slain cop joins a team of undead police officers working for the Rest in Peace Department and tries to find the man who murdered him. Based on the comic by Peter M. Lenkov.
A young woman witnesses a bus accident, and is caught up in the aftermath, where the question of whether or not it was intentional affects many people's lives.