School principal and technical advisor who is secretly the true killer from the 1982 massacre. He disguises himself as the janitor and is ultimately killed by the leads, but survives to be shot by police.
Kastleman holds institutional authority over Steve's past and present, creating a power imbalance.
Kastleman murders the director as part of his ongoing killing spree at the school.
Kastleman sets deadly traps to eliminate crew members, including Farley.
Kastleman systematically eliminates the film crew, starting with the special effects assistant.
Birnbaum is killed and dissected as part of the on-set murders orchestrated by Kastleman.
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