The Walking Dead fans are about to get one step closer to experiencing the zombie apocalypse first-hand: This week AMC kicks off Zombie Apocalypse Marathon, airing each episode of The Walking Dead to date every night in primetime. It all begins Mon., Mar. 25 with the series premiere, “Days Gone Bye” at 8/7c. Throughout the week, episodes from Seasons 1 and 2 will air in order, followed by a Season 3 marathon on Sat., Mar. 30 at 8/7c that leads up to the Season 3 Finale, “Welcome to the Tombs” on Sun., Mar. 31 at 9/8c. Lock the doors, close the windows and stockpile your survival gear. This week, AMC’s Zombie Apocalypse hits home.