In the season premiere, the investigative trio climb aboard the legendary ocean liner Queen Mary, now permanently docked in Long Beach, California, and considered to be one of the most haunted places in the world. Not long after the ship's maiden voyage in 1936, it was put into military service. Tragedy surrounded the ship - nicknamed the "Gray Ghost" - until 1967 when it dropped anchor for good and became a hotel, still in operation today. With reports of multiple apparitions and voices - including that of a former crewman and little girl - the trio prepares for a powerful investigation.

Near the dark and creepy canals of Xochimilco, Mexico sits what might be the world's strangest and scariest tourist attraction: the Island of the Dolls, also home to a sinister and haunted mystery.

The Ghost Adventures Crew travels to a quiet suburb just outside of Seattle to investigate the residence of Keith Linder, who claims a demonic force is wreaking havoc throughout the tranquil, contemporary home. Linder has spent the past year documenting what appears to be extreme poltergeist activity, including mysterious demonic inscriptions written on his walls and a fire spontaneously igniting in the home. With activity of this level, Bagans and the team investigate to determine if Keith's antagonistic spirit is one of the most powerful dark forces they have yet to encounter.

The Ghost Adventures Crew returns to where the Old West never died, Tombstone, Arizona, to investigate Big Nose Kate's Saloon, a place tormented by a spirit known only as the Swamper. But the guys also stop by and reinvestigate the Bird Cage Theatre and pay their respects to Leroy Colomy, a close friend who was tragically shot and killed only a short distance from the doorsteps of the theatre.

Zak, Aaron, Bill and Jay travel to the Sallie House, claimed to be one of the most haunted houses in the Midwest, to investigate the claims of demonic attacks after the experiences of the Pickman family in 1992.

Zak, Nick and Aaron investigate the Lemp Mansion and Brewery in St. Louis, Missouri. After years of tragedy and suicide, this great American landmark is now known as the country's top 10 most haunted locations.

Zak, Aaron, Billy and Jay travel to the Bell Witch Cave in a secluded area in Adams, Tennessee, where they will investigate the notorious legend of the Bell Witch that has plagued the Bell family and other families on the nearby farmland in 1817.

Ghost Adventures travels to Duluth, MN, where they become the first paranormal team to investigate the Nopeming Sanatorium, where thousands of lives were lost to tuberculosis.

Zak, Nick and Aaron head to Oklahoma City, Oklahoma, to investigate a home terrorized by an ancient, demonic force. The Zozo Demon is known for attacking and possessing its victims through a spirit board.

Ghost Adventures heads to Texas to investigate a horror hotel, haunted by a spirit of a little girl. Before the lockdown, the guys take a detour to verify reports of a spirit pushing parked cars onto train tracks.

Ghost Adventures crew spend the night in the ghost town of Goldfield, Arizona, which was the original Apache Junction. Zak tests new gas-detecting equipment in the mines, and Jay Wasley is utterly startled when he sees a man in a trench coat roaming through the town. The team also ventures into the cursed lands of the Superstition Mountain in order to find out any details related to the hectic mining for the Lost Dutchman's Gold Mine and its connections to Apache Junction.