Alex Moran, Darin Brooks has begun his senior year at Blue Mountain State, deciding to dedicate his final semester more to partying since the team’s prospects look shaky. Meanwhile, a new dean threatens to take over the Goat House, the infamous party hub for the football squad. Dean Olivares, Ed Amatrudo, eyes the place with a wary eye, while Alex reaches out to Thad Castle, Alan Ritchson, who has just been drafted into the NFL, to buy the house back. Thad agrees, but only if Alex throws a legendary party in his honor that lives up to Thad’s wild expectations.
The party, bursting with drugs and carnival-style amusements, spirals past control, yet Thad leaves oddly impressed by the spectacle. The Goat House becomes the focal point of a heated bidding war—the auction starts, and Thad throws down five million dollars, after having outbid himself from three million. Alex basks in the moment of reclaiming “his” house, but Thad confronts him, accusing him of thinking only about himself in the drive to resurrect Thadland. The confrontation ends with Thad banishing Alex from the Goat House.
That night, Alex dreams of a bleak future: Sammy is dead, Thad—now a washed-up middle-aged figure—lives in the Goat House as a hollow shell, and Alex is forced to be his house boy. Waking in a deserted field, Alex hails a passing car driven by his old teammate, Craig Shiloh, Sam Jones, and the two head back to what Thadland has become—a decaying, dangerous relic with derelict rides and a pattern of tragedy born from reckless partying. They discover a drugged Sammy, who has consumed Billy as a brutal act of revenge.
A press conference about Thadland and the squad’s ongoing misconduct erupts, with Coach Marty Daniels, Ed Marinaro, railing against the press and the Dean, ultimately admitting to misdeeds and showing no remorse. In the Goat House basement, Alex corners Harmon Tedesco, James Cade, about the inhalant drugs packed in balloons. Harmon reveals that the gas comes from a fermented mixture in the house’s septic系统. Faced with this revelation, Alex, still carrying the captain’s authority, compels Harmon to shut down the dangerous tanks. Upstairs, he finds Thad and Mary Jo Cacciatore, Frankie Shaw, both high from the drug. Alex questions Thad about his supposed wealth and why he wastes time at campus parties instead of training with his pro team. Thad tearfully confesses that his contract was voided due to his bad behavior, and that the wealth he wielded was fake. In a moment of despair, Thad pulls a handgun, claiming that if he can’t have money or friends, he wants to die. Alex refuses to help him hurt himself, but he does have another plan in mind.
In the basement, Dick Dawg, Thad’s cousin, Jimmy Tatro, begins rigging the septic and gas tanks to explode, only to be thwarted when Sammy—still drugged—stumbles into the conflict and is knocked unconscious by falling debris. The Goat House starts to crumble, forcing everyone inside to evacuate. In the chaos, Alex and Thad share a final embrace, with Thad urging him to remember his story. Alex leaves with Mary Jo, while Dick Dawg carries the unconscious Sammy to safety as the house erupts in flames and collapses.
Mary Jo consoles Alex, who insists the destruction is a brutal reminder of what the place had become—“just a house.” The Dean celebrates his supposed victory but begins to hyperventilate from the adrenaline. Harmon, pretending to offer oxygen, administers a hit of his drug to the Dean, who then hallucinates and begins humping Holly, likely costing him his job and reputation. In a post-incident lineup, Alex Moran, Darin Brooks ; Mary Jo Cacciatore, Frankie Shaw ; Larry Summers, Omari Newton ; Donnie Schrab, Rob Ramsay ; Harmon, James Cade ; and Radon Randell, Page Kennedy raise a toast to Thad’s memory.
One month later, Thad lounges on a beach, mojito in hand, as the memory of Thadland lingers in the air.