The Return of the Living Dead

The Return of the Living Dead is a 1985 American black comedyzombie horror film written and directed by Dan OBannon and starring Clu Gulager, James Karen, and Don Calfa.

At a medical supply warehouse in Louisville, Kentucky, foreman Frank tries to impress the companys newest employee, Freddy, by showing him military drums that contain the remains of an army experiment gone wrong that inspired the film Night of the Living Dead. Frank accidentally unleashes the toxic gas inside the barrel, knocking them unconscious, and reanimating a corpse inside a meat locker, forcing the pair to call their boss Burt to help them deal with the situation. The three are able to dismember the cadaver and Burt decides to bring the remains to the nearby mortuary so it can be burned by his friend, Ernie. Elsewhere, Freddys girlfriend, Tina, and his group of friends wait for him to finish work by messing around in a nearby graveyard.Despite his initial shock, Ernie burns the zombie remains, unknowingly releasing the toxic gas into the air. Tina goes into the warehouse to meet Freddy but instead gets trapped in the basement by Tarman, a zombie that escaped from the barrel. The gas causes a sudden acid rainfall, causing the rest of Freddys friends to flee the graveyard, only to find that their car wont start, forcing them into the warehouse. Inside, they hear Tinas screams from the basement, and though they are able to rescue her, Suicide is killed by Tarman. The group decides to head for the mortuary by crossing through the graveyard, where they witness hundreds of zombies rising from their graves, causing the group to split up. Tina, Spider, and Scuz make it to the mortuary, Chuck and Casey return to the warehouse, and Trash is surrounded and killed. ........

Source: Wikipedia