VIDEO: Inside THE WALKING DEAD's 'Zombie School'

In anticipation of the upcoming fourth season of THE WALKING DEAD, set to premiere in October, AMC has debuted a behind-the-scenes look at the show's "zombie school." Check out the featurette, showing off what it takes to become a 'walker,' below!

The season three finale of The Walking Dead premiered at 9 pm on Sunday, delivering its largest audience ever with 12.4 million viewers and 8.1 million adults 18-49, making the series the number one program for the night and the week for total viewers and in the demo. The series' season average is also number one for the broadcast season for adults 18-49 for all of television outdelivering everything including "The Big Bang Theory," "The Voice," "Game of Thrones," "Modern Family," and almost doubling "The Bible." With Live plus 3, "The Walking Dead" typically, adds, at least an additional 3 million viewers.