You may think zombies exist only in movies. Zombies are actually a very real part of animal and insect species, and maybe even humans.
You may be a zombie right now and don’t realize it!
Take the classic zombie movie plot: a plague that turns humans into mouth frothing predators that eat other humans.
Often a single bite or bit of saliva will infect the “good guys.” The human race is doomed, until the hero or heroine finds an antidote and saves everyone.
The zombie theme is basically founded on a virus and how it alters the mental state or actions of other animals. These changed actions help the virus to spread. Like all organisms, the virus just wants to flourish and reproduce.