At the Scientific Research Institute for the Study of Homicidal Baked Goods, the Gingerdead Man [William Butler] is visited by Clarissa Darling, an FBI agent, who intends to kill him because he supposedly houses the soul of her brother Toothless McHomeless, who was driven to suicide after taking a bite of the Gingerdead Man. As she raises her weapon to shoot the “half-baked piece of shit,” a group of animal rights activists breaks in, overpowers her, and releases the Gingerdead Man along with the rest of the baked inmates. The killer cookie makes his way to the room labeled Time Travel Studies, shoots Dr. Acula and his partner, and is sent back through time as Security closes in.
He materializes at a Roller Disco Beauty Pageant in 1976 and cannot get the remote to work to return, so he decides to unleash mayhem instead. The club’s owner, Trixie, complains about impending tax issues and announces plans to close, while the disco’s roster of skaters is soon put in peril. The first dramatic act unfolds as the Gingerdead Man murders three car-washing “bimbos,” Doreen, Connie, and Sandy, by attaching a hose to a tank of hydrochloric acid and melting them away. Trixie introduces her telekinetic niece Cherry [Paris Wagner] and tasks her with helping pack up the office. Cherry meets one of the disco’s staff, Randy, and shares a brief skate with him against Trixie’s wishes.
Inside again, the Gingerdead Man targets Ingrid Harshman, who tries to engage with him through a lewd misunderstanding, but she refuses and exits. He also discovers the disco’s janitor Bugsby [Mike C. Manning] in a compromising scene with two drugged teens, Peaches [Jacqui Holland] and Tux, and eliminates them with a nail gun. Cherry earns a spot as a Pageant finalist, much to Trixie’s annoyance, who reveals a long history of mischief and a past incident involving the Pearl Harbor attack caused by her skating talent and the four-year champion Tammy Pimento [Kimberly Dawn Guerrero]. When Tammy learns she might lose the vote, her boyfriend Wheels Epstein orchestrates a plan involving a bucket of pig’s blood to drench Cherry during the ceremony.
The Gingerdead Man continues his rampage by killing the shoe clerk Leroy with a meat cleaver in the bathroom and tampering with the DJ Angel’s cocaine by mixing it with a cleaning product, taking over the music for the night’s “Saturday night cleaver.” Two kids, Pickles [Zachary Haas] and Tina, find the remote and manage to activate it, sending themselves and a new wave of travelers through time. The cookie’s reckless domination escalates as the prank backfires and the pig blood bucket drenches Tammy instead; he then slashes Tammy’s crew, Coco [Tiffany Danielle], Yoko [Steffinnie Phrommany], and P.J. [Jean Louise O'Sullivan], dead.
When the cookie shoots Trixie in the shoulder, Cherry uses her telekinesis to lock the doors and drops the disco ball, electrocuting almost everyone except herself, Trixie, Ingrid Harshman, Randy, and the Gingerdead Man. Just as he closes in, Pickles and Tina return from their time-traveling mission with Clarissa Darling, Security, Adolf Hitler [Bogdan Szumilas], Charles Manson, Jeffrey Dahmer [Peter Stickles], and Lizzie Borden. The six travelers overpower the cookie, tear him apart, and stuff him into a cookie jar-magic lamp.
Pickles and Tina reveal the winning lottery numbers to their aunt, ensuring the club’s future stability. They also reveal that because they warned the FBI agent about the attack, the events of the entire film never happened; everyone who had died is brought back to life, and the time travelers return to their own eras, including the aunt, who briefly travels back to prevent herself from provoking Pearl Harbor again.
