The story begins in June 2012 in Oxnard, California. Recent high school graduate Jesse has a party which includes his family and friends to celebrate his graduation. One morning, Jesse finds a mysterious bite on his arm. Later, he and his friend Hector are confronted by two thugs who attack them, but the thugs are somehow knocked out by Jesse. When they show the incident to their other friend Marisol, Jesse cannot remember how it happened. After some strange activity, he realizes that he has superhuman abilities before he tests and plays with them.
Anna, the strange old witch-like neighbor of Jesse, is killed, and the police suspect that Oscar, a former classmate of Jesse, is the prime suspect. Jesse and his friend decide to find out what Anna’s apartment looks like. They find black magic rituals and a picture of Jesse. They also discover several VHS tapes – including tapes of Katie & Kristi (from the third film). The next day, Jesse and Hector meet Penelope. Penelope finds a trap door in the apartment leading to a basement and is grabbed by an arm before she breaks free and runs away, while Oscar emerges from it and hides himself in the bedroom. Jesse arrives back and chases Oscar upon seeing him, who reveals that he did kill Anna because his arm had been bitten by her. Oscar then commits suicide by jumping from a building onto the top of a car.
Jesse is becoming even more dark and his homicidal actions become uncontrollable. More horrifying events take place one after another as Jesse is slowly being possessed by something or someone, that time seems to melt and characters from past episodes come alive once more. Watch how this installment of paranormal activity unfolds and horrifyingly ends.
The cast of Paranormal Activity: Marked Ones include Andrew Jacobs as Jesse, Richard Cabral as Arturo, Carlos Pratts as Oscar Hernandez, Gabrielle Walsh as Marisol, Jorge Diaz as Hector, Catherine Toribio as Penelope, Noemi Gonzalez as Evette, Gigi Feshold as Natalie, David Saucedo as Cesar Arista, Julian Works as Pablo, Molly Ephraim as Ali Rey , Katie Featherston as Adult Katie, Chloe Csengery as Young Katie, Jessica Tyler Brown as Young Kristi, and Micah Sloat as Micah.