Return of the Living Dead: Necropolis

A group of teenagers discover that a shady corporation has been harvesting zombie corpses from Chernobyl and conducting illegal experiments on them at a secret facility. When several of their friends are captured and taken to the complex, the remaining teens mount a rescue mission, only to trigger a full-scale zombie outbreak within the building. The survivors must fight their way through hordes of the undead whilst trying to escape and expose the corporation's crimes.