The document discusses the evolution of movie zombies from their origins in George Romero and John Russo's 1968 film Night of the Living Dead. Romero and Russo had a dispute over how to continue the series, with Romero creating films under the "Dead" moniker like Dawn of the Dead and Russo creating films under "Living Dead" like Return of the Living Dead. Romero's zombies moved slowly, could not communicate, and had to have their brain destroyed. Russo's zombies outbreak was caused by toxic gas, they moved quickly, could communicate fully, and were stopped with electrical current.