When foreman Frank shows new employee Freddy a secret military experiment in a supply warehouse in Louisville, Kentucky, the two klutzes accidentally release a gas that reanimates corpses into flesh-eating zombies. As the epidemic spreads throughout the town, and the creatures satisfy their hunger in gory and outlandish ways, Frank and Freddy fight to survive with the help of their boss and a mysterious mortician.

Kids all over America want Silver Shamrock masks for Halloween. Doctor Daniel Challis seeks to uncover a plot by Silver Shamrock owner Conal Cochran.

Dennis is still waiting to progress to district manager from the restaurant where he works.

In this first sequel to The Return of the Living Dead, a group of kids discover one of the drums containing a rotting corpse and release the 2-4-5 Trioxen gas into the air, causing the dead to once again rise from the grave and seek out brains.

When a bumbling pair of employees at a medical supply warehouse accidentally release a deadly gas into the air, the vapors cause the dead to re-animate as they go on a rampage through Louisville, Kentucky seeking their favorite food, brains.