In the film: Robert Neville is an army virologist who’s immune to the vampire disease and is supposedly the last man on earth. He then finds two other uninfected people and ends up sacrificing himself to ensure that they get to a fortified compound of other humans with a cure. He then becomes the title “Legend.”

In the book: There’s nothing special about Neville, other than the fact that he’s immune to the virus. He spends his days hunting vampires and his nights hiding and trying to learn biology to understand what’s happening. He soon learns that the entire population of the planet has become vampires, and he is their boogyman; the monster that stalks them when they sleep and slays their children. He is the legend that haunts their dreams.