Christopher Knight, Adrianne Curry, Danny Bonaduce, and Gretchen Bonaduce bring CPP back to a haunted prison in Nashville, TN, to investigate the paranormal in the season finale.

Christopher Knight, Adrianne Curry, Danny Bonaduce, and Gretchen Bonaduce bring CPP back to a haunted prison in Nashville, TN, to investigate the paranormal in the season finale.

Evander Holyfield, Debra Wilson, Jason “Wee Man” Acuña (“Jackass”), Nikki Ziering and Julio Iglesias Jr check out the ruins of the cult commune.

Evander Holyfield, Debra Wilson, Jason “Wee Man” Acuña (“Jackass”), Nikki Ziering and Julio Iglesias Jr check out the ruins of the cult commune.

Ernie Hudson, Eric Nies, Nicole Eggert, Willie Garson, and Courtney Friel investigate a haunting at an industrial mill.

Ernie Hudson, Eric Nies, Nicole Eggert, Willie Garson, and Courtney Friel investigate a haunting at an industrial mill.

David Carradine, Coolio, Andrew Firestone, Mia St. John, and Bridget Marquardt investigate a haunting related to mill accidents in Bangor, Maine.

David Carradine, Coolio, Andrew Firestone, Mia St. John, and Bridget Marquardt investigate a haunting related to mill accidents in Bangor, Maine.

Gilbert Gottfried, Kimberly Caldwell, Traci Lords, Evan Farmer, and Jeremiah Trotter revisit the haunted asylum to track down another ghost. This time, it is the spirit of Mad Ray, a criminal who suffered from paranoid schizophrenia.

Gilbert Gottfried, Kimberly Caldwell, Traci Lords, Evan Farmer, and Jeremiah Trotter revisit the haunted asylum to track down another ghost. This time, it is the spirit of Mad Ray, a criminal who suffered from paranoid schizophrenia.

Mariel Hemingway, Joe Piscopo, Michael Bergin, Picabo Street, and Tonya Cooley investigate a facility known as "The Walls," a haunted maximum security prison in the south, where warden Tom Grisholm was murdered by an inmate.

Mariel Hemingway, Joe Piscopo, Michael Bergin, Picabo Street, and Tonya Cooley investigate a facility known as "The Walls," a haunted maximum security prison in the south, where warden Tom Grisholm was murdered by an inmate.

Rachel Hunter, Ethan Zohn, Godfrey, Tony Little, and Traci Bingham investigate the paranormal at a haunted Connecticut asylum. It is the site of mental patient Nell Marley's suicide, supposedly as a result of her possession by a spirit named Pearl.

Rachel Hunter, Ethan Zohn, Godfrey, Tony Little, and Traci Bingham investigate the paranormal at a haunted Connecticut asylum. It is the site of mental patient Nell Marley's suicide, supposedly as a result of her possession by a spirit named Pearl.

Gary Busey, Donna D'Errico, Toccara Jones, Jenna Morasca, and Hal Sparks visit the Waverly Hills Sanatorium in Louisville, Kentucky, to investigate ghost sightings. The abandoned hospital, built to house tuberculosis patients and reportedly the site of thousands of deaths, is considered to be one of the most haunted hospitals in the United States.

Gary Busey, Donna D'Errico, Toccara Jones, Jenna Morasca, and Hal Sparks visit the Waverly Hills Sanatorium in Louisville, Kentucky, to investigate ghost sightings. The abandoned hospital, built to house tuberculosis patients and reportedly the site of thousands of deaths, is considered to be one of the most haunted hospitals in the United States.