The season's sucess is a testament to Mazzara's fast-paced, more horrific vision of the show.Sutter has previously weighed in on AMC's disputes with its showrunners, including Mad Men creator Matthew Weiner.In August 2011, Sutter said the network fired the original Walking Dead showrunner, Frank Darabont, and entered into tense negotiation with Breaking Bad creator Vince Gilli