The Walking Dead series is soooooo dark.... 
 "How dark is it, Kemper?" 
 The Walking Dead series is so dark that: 
 - each volume acts like a small black hole and immediately sucks all available light out of any room they're placed in. 
 - it used to give wardrobe advice to Johnny Cash. 
 - Stephen King considered calling the Dark Tower series The Walking Dead Tower. 
 - people who have read it have then watched Requiem for a Dream to cheer themselves up. 
 - Andrew Vachss had to stop reading it because it was too grim for him. 
 - whenever sales of anti-depressants drop off, the pharmaceutical companies start handing out free copies. 
 - that it apparently drove the AMC executives mad and led to them firing Frank Darabont in a cost cutting measure on the highest rated show it ever aired. 
 And this one is worse than usual. So if you like your zombie apocalypses to plumb the depths of despair and the limits of humanity, this is the one for you.