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Ghostbusters
Particle physicists and estranged friends Abby Yates and Erin Gilbert co-authored Ghosts from Our Past, a book detailing their paranormal investigations since high school. Erin later disavowed the work, while Abby continues her research at the Kenneth P. Higgins Institute of Science in Manhattan, with engineering physicist Jillian "Holtz" Holtzmann as her partner. Now a professor at Columbia University and in line for tenure, Erin, discovering that Abby republished their book, convinces her to cease its publication if she helps Abby and Holtzmann investigate a haunting at the Aldridge Mansion. They encounter the malevolent ghost of the family’s eldest daughter before she escapes, restoring Erin's belief in the supernatural and friendship with Abby. Erin loses her bid for tenure at Columbia after their vlog becomes viral. Erin offers to join Abby and Holtzmann as the latter are dismissed from Higgins Institute. After stealing equipment, they establish temporary headquarters above a disused Chinese restaurant. They verbosely name themselves "Conductors of the Metaphysical Examination", build trappings and hire jock Kevin Beckman as a receptionist.
MTA staffer Patty Tolan encounters a ghost in a subway terminal built under a former prison and contacts the team. They find the ghost and test Holtzmann's prototype proton packs on the entity, but fail to capture it. They advertise their services with a "no ghosts allowed" logo that Holtzmann had based on a graffiti artist's defacement and the name pundits have labeled them "Ghostbusters". Patty joins the team, providing city expertise, PPE and a repurposed hearse from her uncle dubbed " Ecto-1 ".
Mad scientist and occultist Rowan North has triggered supernatural events by attracting ghosts across Manhattan with self-developed ionizers modeled after the Ghostbusters' technology, allowing him to experiment and create a dimensional vortex powered by turned PSI energy. When Rowan plants another device at a music festival, the Ghostbusters are called and capture a demonic ghost there, becoming city sensations but antagonizing him. When debunker Doctor Martin Heiss challenges the quartet, Erin releases the ghost as evidence; it throws him out of a window and escapes.
The group is brought before Mayor Bradley and his deputy, Jennifer Lynch, who reveal that they and the DHS are aware of the city's supernatural activities. While privately acknowledging the team's work, they publicly denounce them as fraudsters. The Ghostbusters realizes Rowan is planting his devices along ley lines, with their alignments intersecting at the Mercado Hotel in Times Square, a site of violent occurrences where Rowan's vortex will breach the netherworld, potentially triggering an apocalypse. When they confront him in the building's basement, Abby warns him of apprehension, but unwilling to turn himself in, Rowan electrocutes himself with his main machine. After deactivating it, Holtzmann finds an annotated copy of Ghosts from Our Past that explains the similarity between their technologies. Erin later discovers that Rowan planned his suicide to become a ghost himself.
Rowan returns as a deity-like ghost and attacks the Ghostbusters at their headquarters by possessing Abby, but Patty thwarts him. He then possesses Kevin, escapes to the hotel, opens the portal and releases galvanized ghosts. Rowan subdues the authorities, but the Ghostbusters fight through his army to reach the portal. After leaving Kevin's body, Rowan takes on a kaiju -sized form based on the ghost in the Ghostbusters' logo and becomes rampant. The team uses the Ecto-1's nuclear reactor to incite a nuclear explosion inside the vortex; it reverses the portal, forcing Rowan and the ghosts back in and saving the city. Rowan attempts to take Abby with him, but Erin leaps into the portal and rescues her.
Despite the city's fascination with the supernatural and its lauding of the Ghostbusters as heroes, the mayor continues to denounce them publicly while covertly funding their operations. With added resources, the Ghostbusters move to a disused firehouse, where they build more equipment, including an ecto-containment system. While investigating EVP, Patty hears the word " Zuul ".