this underlying plot ripped off Friday the 13th, then ....
the underlying plot of this (the murder in '45 at the dance, and then the continued serial killings decades later) totally ripped off the underlying/root-cause plot of Friday the 13th......THEN, My Bloody Valentine went on to rip off the underlying/root-cause plot of THIS.....no complaints, though!! about any of them - they're all great fun!
"....well, GO get 'em SHERIFF!!" - Mother Firefly, The Devil's Rejects