Zombie apocalypse! TV’s 6 most successful shows about the undead

It’s not exactly original to argue that there are too many cop shows on TV. Too many legal dramas. Too many medical dramas.Even too many shows based on comic books — which is not a hard case to make, given that there have been more than 20 of them this year.But who would’ve ever thought there’d be a glut of zombie shows on the TV market?Vampires, sure. They’re evil and sexy and scary. But zombies? They’re gross and disgusting and terrifying.Do we really need h