Three cheers -- or er, braaaaains -- for the movie zombie, which turns 100 this year. How did the zombie get a death grip on our culture? Let's track the monster back to World War I, where it first crawled out of the grave, before it took a bite out of everything from shopping malls to armageddon preppers. Want to learn how to survive a zombie apocalypse? Hear from experts like "World War Z" author Max Brooks and the U.S. government's Centers for Disease Control and Prevention. Special guest: actress Chloë Sevigny ("The Dead Don't Die").