Day of the Dead(1985)

Zombies have been on the rampage for so long that there are very few humans left alive. One of the survivors, Dr. Logan, is conducting experiments on captured zombies in an underground compound to try to find a way for people and the living dead to coexist peacefully. Unwillingly sharing the facility with the doctor are a military officer named Rhodes and his men. Another scientist named Sarah and some other survivors seek sanctuary at the lab, and arrive just as the conflict between Logan and Rhodes has reached a boiling point.