Inside The Walking Dead: Walker University

AMC has released a sneak preview video of tonight's Inside The Walking Dead: Walker University. In the video, Walking Dead executive producer and special effects make-up guru Greg Nicotero explains, "We have to make them scary, creepy, and ferocious."

AMC's second Walking Dead documentary will follow the journey from extra to walker. Viewers will learn that there is much more to becoming part of the living dead than just make-up, and will get an inside perspective on the choreography, acting and motivation behind each zombie, including a look at what takes place at The Walking Dead's own Zombie School.

Inside The Walking Dead: Walker University airs on Tuesday, July 15, 2014 at 10PM ET on AMC.