Zak and the crew return to LA's Skid Row district to investigate a nearly abandoned building steeped in a dark, grisly history that rivals the Hotel Cecil; the guys have their hands full as both the dead and the living push back on the investigation.

The crew pierces the seal on California's Mira Loma Detention Center; decades of death, violence and bloodshed have scarred this massive compound, painting a thick layer of doom on every square inch and delivering some of the most solid evidence yet.

Zak and the crew check in for a night of terror at a Flagstaff, Arizona, hotel where guests and staff have reported troubling paranormal experiences for decades. The chaotic spirits trapped within are wreaking havoc, and the GAC may be the only ones who can help.

Echoes of a past investigation come into focus as Zak and the crew investigate a stately California ranch steeped in tragedy. A dark energy has taken root on the land, and the team must unravel its haunting secrets to help the terrified caretakers.

Zak and the crew venture to California's first oil boomtown to investigate countless reports of ghostly activity inside its buildings and glowing anomalies in the surrounding hills. Paranormal chaos ensues as the guys attempt to unravel the mystery of Mentryville.

Zak and the crew peel back the glamorous façade of a Phoenix, Arizona, hotel to expose a darkness that's said to drive people mad. As they explore the vacant rooms and halls, the team encounters a demonic presence that could be responsible for countless deaths on the property.

Zak and the crew visit King Gillette Ranch, a sprawling compound built on sacred land. Its dark history plus a brush with a religious cult has birthed violent spirit activity that drains the living of their energy, making this the GAC's heaviest investigation yet.

The crew awaken hostile spirits in Nevada when they investigate the Commercial Hotel and Casino; the building's rough history of lawless cowboys, cutthroat gamblers and exploited women fuels a malevolent energy.

The crew investigates reports of vicious paranormal attacks at LA's Heritage Square Museum; as the team explores this collection of Victorian homes, they suspect a dark portal is responsible for shadow figure sightings and poltergeist activity.

The crew investigates reports of vicious paranormal attacks at LA's Heritage Square Museum; as the team explores this collection of Victorian homes, they suspect a dark portal is responsible for shadow figure sightings and poltergeist activity.

Zak and the crew descend upon a Southern California park to investigate a preschool haunted by tragedy and violent deaths. The team wants to determine if an ancient tribal tale of vengeance has continued to cast a dark curse on this former homestead.