The Gingerdead Man is a criminal who is sent to the electric chair and comes back to life as a Gingerbread Man.
In a Waco, Texas, diner, Cadillac Jack's, crazed killer Millard Findlemeyer opens fire on the Leigh family, killing Jeremy and James, but leaving Sarah and her mother, Betty, alive. Findlemeyer is arrested and sentenced to die in the electric chair. After the execution, Findlemeyer is cremated, and his ashes are sent to his mother, a Witchcraft who mixes the ashes with a gingerbread spice mix. The Bakery, a Bakery run by the Leighs, is in dire straits, and Betty has been reduced to a shotgun-toting alcoholic; Sarah sends her home with Bakery employee Julia. Jimmy Dean attempts to buy Sarah out, so he can knock down The Bakery, which he bemoans as an eyesore. After exchanging hostilities with Dean's daughter Lorna, Sarah defers the decision.
Kelvin Cheatum (K-von Moezzi) is trying to save his father's studio from bankruptcy by producing worthy heirs to his father's slate of classic low-budget cult films. Cheatum Studio's current productions include ''Hamburger Time Traveler Detective'', ''Space Spankers 2015'', and the ninth entry of his father's famous killer puppet franchise ''Tiny Terrors''; however, things aren't going as planned: the cast and crew members are losing patience with the long hours, lack of pay, terrible scripts, and Kelvin's over reliance on good will towards his father. A blogger who goes by the name of "Demon Warrior 13" is organizing effective boycotts of their films.
At the Scientific Research Institute for the study of Homicidal Baked Goods, The Gingerdead Man is visited by a woman from the FBI (Laura Kachergus), who is revealed to be the sister of Toothless McHomeless of Gingerdead Man 2: Passion of the Crust, who was driven to suicide by the previous Gingerdead cookie. As she's about to take her revenge on this "half baked piece of shit", a group of activists for animal rights break into the institute, overpower her, and release the Gingerdead Man and the rest of the baked inmates. The killer cookie comes across the "Time Travel Studies" room, shoots the two scientists, and is sent back through time as security tries to kill him.
The Gingerdead Man seeks revenge against Sarah Leigh for causing him to live his life in the body of a gingerbread man. Her only hope is to team up with Larnell who has problems of his own in the form of a magical talking bong named Eebee.