The Dead Hate the Living! (2000)

When a renegade band of young filmmakers break into an abandoned hospital to make their horror epic, they stumble upon a real dead body and decide to use it in their movie. They accidentally bring it back to life, open a portal to a dead world that releases dozens of other zombies, then struggle for their lives in a desperate attempt to flee from the creatures who apparently have them hopelessly trapped in the hospital.

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