Living Dead is a blanket term for various films, series, and other forms of media that all originated from, and includes, the seminal 1968 horror film Night of the Living Dead conceived by George A. Romero and John A. Russo. The loosely connected franchise predominantly centers on different groups of people attempting to survive during the outbreak and evolution of a zombie apocalypse.  (I totally stole that from wikipedia!)

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1-6 are from George A. Romero's Dead series
7-9 are remakes
10-12 are homages or parodies