DAY OF THE DEAD

Seven years after the events of Dawn of the Dead, the zombie apocalypse has ravaged the entire world. The societal structures that used to safeguard civilization have mostly vanished, leaving the scattered remnants of human survivors vastly outnumbered by the zombie populations. A handful of scientists and soldiers live within a secure underground missile bunker in the Florida Everglades. The scientists are trying to find a solution to the zombie pandemic; the soldiers have been assigned to protect them. Dr. Sarah Bowman, soldier Private Miguel Salazar, radio operator Bill McDermott, and helicopter pilot John fly from their underground base to Fort Myers in an attempt to locate additional survivors. They find only a large horde of the undead and return to the base, where they are told that the military detachment's officer-in-charge Major Cooper has died. Sarah becomes concerned over Miguel's worsening mental state, but he lashes out at her until she stops trying to help him.

Dr. Logan, the lead scientist (nicknamed "Frankenstein" by the soldiers because of his grisly surgical dissections of the zombies), believes that the undead plague victims can be made docile and domesticated through training and conditioning. He keeps a collection of captive undead for use as test subjects in a large underground corral in the compound. Sarah vehemently opposes Logan's conditioning research; instead, she wants to search for a possible cure for the virus. Sarah discovers that Logan has been experimenting on the corpses of the dead soldiers, including Major Cooper. Fearful that the other soldiers will turn on them, Sarah reluctantly keeps this a secret.

The soldiers range from decent and workmanlike to mean-spirited and confrontational, especially the unstable Captain Rhodes. Rhodes vehemently objects to the dangers involved in capturing and maintaining zombie specimens, and tension between soldiers and scientists worsens in the face of dwindling supplies, the loss of communication with other survivors, and slow, uncertain progress in the research. During a meeting, Rhodes declares that he is establishing martial law under his command in the compound. He only grants the scientists "some" time to prove results and declares that he will execute anyone who interferes with his leadership. He also threatens to abandon the scientists and leave the compound, cutting off their protection from the undead hordes, though he cannot rebut Logan's sarcastic asides that the soldiers have nowhere to run to and no way to stop the zombies on their own.

Disturbed by Rhodes' threats, Sarah discusses the situation with John and Bill, who reside in an RV at the far end of the tunnels and bluntly tell her they do not believe in anything she and the scientists are trying to accomplish. John professes his conviction that the zombie plague is a form of divine retribution against mankind, and suggests that the three of them should take the helicopter, abandon the soldiers, and fly to a desert island somewhere where they could live off the land and start a new life. Logan hopes to secure Rhodes' goodwill by showing him the results of his research. He is especially proud of "Bub", a docile zombie who remembers some parts of his past life and engages in rudimentary human behavior. Rhodes, however, is not impressed and loses more patience with the scientists.

During a zombie roundup procedure, a zombie escapes its harness when Miguel loses his focus, resulting in the deaths of soldiers Miller and Johnson. Miguel snaps and attempts to kill the creature, but another zombie bites him on the arm. With John and Bill's help, Sarah amputates and cauterizes Miguel's arm to stop the infection. Rhodes calls off the experiments and demands that all captive zombies be destroyed, as well as denying any further help from him and his remaining men.

Sarah and Bill later go to the operating theater to gather medical supplies for Miguel, where they find that Logan has been experimenting on Miller and Johnson's remains. After discovering evidence that Logan has drifted into insanity due to his failure to civilize the zombies' baser instincts, Bill decides that they should leave in the helicopter immediately. Rhodes finds out that Logan has been feeding the flesh of his dead soldiers to Bub as positive reinforcement for his behavior. Furious, Rhodes kills Logan and seizes the remaining scientists and non-military personnel, stripping them of their weapons. Rhodes attempts to force John to fly him and his remaining soldiers away from the base, which John refuses to do. In response, Rhodes kills Logan's assistant Dr. Fisher, locks Sarah and Bill inside the zombie corral, and orders Private Steel to beat John into submission.

Back in the laboratory, Bub uses his newly developed intelligence to free himself from his chain restraints and later discovers Logan's corpse. In a display of human emotion, he mourns the loss of his instructor, then picks up a pistol and goes in search of revenge. Meanwhile Miguel, whose self-control has finally snapped, heads off to the surface. While the soldiers try to go after him, John knocks out Rhodes and Torrez, steals their guns, and goes into the zombie corral to rescue Sarah and Bill.

Outside, a suicidal Miguel opens the perimeter fence, letting in hundreds of zombies, which surround him on the missile elevator platform. As they begin tearing at him, he activates the elevator control box, lowering the ravenous zombies into the complex. As the undead swarm the bunker, Rhodes leaves his men behind to be killed. Chased by Bub, he desperately attempts to escape, but runs into a mass of zombies and is shot in the stomach by Bub, who mockingly salutes Rhodes as he is torn apart. John, Sarah, and Bill make it to the chopper and escape to a tropical island.

The surviving protagonists escape from the bunker, leaving the zombies to overrun what remains.

The film concludes with the remaining survivors achieving a narrow escape, underscoring Romero’s bleak worldview where the human race is fractured and solutions are elusive. The ending leaves humanity’s fate uncertain but emphasizes the breakdown of order and the futility of clinging to old systems in the face of overwhelming catastrophe.