Ghoul Marcus

Ghoul Marcus is the main antagonist of the 2016 supernatural horror film and prequel, Ouija: Origins of Evil. He's a demonic entity that was accidentally summoned by Alice Zander and possesses her daughter, Doris.

He was portrayed by Doug Jones, who also played Pale Man.

appearance
Marcus appears as a tall, thin shadowy figure with glowing yellow eyes and has no mouth.

film
While the Zander family is still reeling over the recent death of Roger, Alice's husband and the kids' father, Lina suggests Alice to incorporate a Ouija board into her readings. While trying out the board, she unknowingly contacts a spirit named Marcus that begins to possess Doris.

When Alice received a notice that the bank intends to auction their house, Doris contacts the board for help, believing she is communicating with her dead father. The spirit leads her to a secret compartment behind the basement wall containing a bag of cash.

Later, Doris becomes possessed by the evil spirit. Lina, who is becoming disturbed by her sisters strange behavior, finds papers written by Doris in Polish, a language she does not know, and brings them to Father Tom to translate. He reveals that the pages are entries written by a Polish immigrant named Marcus, who was held captive during World War II by a sadistic scientist who conducted experiments on him and other captives inside the house's basement. These spirits knew answers that only Roger would know because they have been watching the family since they first moved in.

Meanwhile, Doris kills Lina's boyfriend, Mikey. When they find the body, Father Tom, Alice, and Lina burn the Ouija board in the fireplace. Father Tom finds the secret room where the experiments were conducted, and is possessed by the spirits. He attacks Alice and Lina, but momentarily seizes clarity, only to be killed by Doris. Alice is captured, while Roger's spirit carries an unconscious Lina to her bed. Recalling an earlier moment when her doll's mouth was sewed by her father's spirit to stop the voices, she realizes she must sew Doris' mouth shut to stop the spirits' voices and end the evil for good. She fights off the embodied evil spirits to do so but kills Doris in the process, reuniting with her father. The spirits suddenly possess Lina and stabs Alice in her hip.