sentences:  The novel and its 1964 film adaptation, "The Last Man on Earth", which concern a lone human survivor waging war against a world of vampires, would by Romero's own admission greatly influence his 1968 low-budget film "Night of the Living Dead", a work that would prove to be more influential on the concept of zombies than any literary or cinematic work before it.A popular evolution of the zombie is the "fast zombie" or running zombie.In contrast to Romero's classic slow zombies, "fast zombies" can run, are more aggressive, and often more intelligent.