A psychiatric intern who secretly impersonates a deceased medical student to infiltrate the hospital. He investigates staff misconduct, experiences visions, and ultimately reveals himself as former patient Ben London to exact revenge.
Clark serves as a psychiatric intern under the direct supervision of Dr. Franks.
Clark and Sara work together as staff members, initially appearing as professional allies.
Head Nurse Hendricks assigns Clark duties but becomes a suspect due to her abusive behavior.
Alice is a patient under Clark's observation who shares critical paranormal insights.
Nurse Betty acts as Clark's initial point of contact and logistical support.
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