At
Magic Mountain, Abner Devereaux, the park's engineer and the creator of a series of
animatronic attractions, is not pleased that his works are being overshadowed by an upcoming concert by
Kiss. Calvin Richards, the park's owner, explains that the concert will generate much-needed revenue to make up for the quality control problems that have plagued Deveraux's creations. Melissa, a park guest, becomes concerned when her boyfriend Sam Farrell, a park employee and assistant to Devereaux, has gone missing. Meanwhile, three punks sabotage one of the rides and Deveraux is blamed for the incident. Melissa goes to Devereaux's underground laboratory, which was the last place Sam was seen. Devereaux dismisses her after explaining that he has not seen Sam, but after she leaves the lab, he reveals that Sam has been placed under mind-control through the use of an electronic device on the back of his neck. The three punks enter the Chamber of Thrills, where they fall into traps set by Devereaux. Richards fires Devereaux for his erratic behavior and disregard for the guests' safety; because of this, Devereaux swears revenge upon Richards, the park, and Kiss—all of whom he blames for his misfortune. Shortly after Kiss's first concert at the park, Devereaux attempts to discredit them by unleashing a robotic copy of
Gene Simmons to wreak havoc on the park and the security guards. The band is questioned the next day, but no action is taken, causing the park's officials, including the police and Richards to apologize to them by pardoning Gene of sabotage. Melissa seeks help from the band to find Sam, unaware that the security pass she received from Devereaux is a tracking device. Devereaux has Sam break into the band's lair to try and steal their
talismans, but the plan is foiled due to the force field on the talismans' case. Kiss sneak into the park to confront Devereaux, fighting off Devereaux's animatronic white monkeys in the process. Meanwhile, Sam manages to steal the talismans and delivers them to Devereaux, who then neutralizes Kiss with a ray gun. Kiss, having lost their powers, are imprisoned in the underground lab. Devereaux then sends his robotic Kiss copies in place of the real Kiss in order to ruin their concert and incite a riot. The real Kiss manages to retrieve their talismans, thereby regaining their powers. They escape and quickly head to the stage where they defeat the imposters and save the concert. After the show, Kiss, Melissa and Richards confront Devereaux in the underground laboratory, only to discover that he has frozen in a catatonic state, seemingly revealing himself as the namesake "phantom" of the park.
Paul Stanley removes the mind-control device from Sam's neck, turning him back to normal. Richards laments Devereaux's demise by saying, "He created Kiss to destroy Kiss...and he lost." An alternate take used the final dialogue "He created KISS...to defeat KISS...and in the end, it destroyed him." == Cast ==