The Dead Hate the Living

Young filmmakers sneak into an abandoned medical research facility to make a low-budget horror feature about a scientist who raises the dead to be his zombie slaves. Little do they know that the facility was abandoned after a scientist's experiments to revive the dead through alchemical means went horribly wrong. When they discover the scientist's body, they decide to go use what they've found to add to the film's production value and accidentally manage to open a rift into the dimension of the dead. The script is a patchwork of influences. Effects are impressive, with many spectacular (and gruesome) zombies.