The Walking Dead fans have been champing at the bit for the show’s February return, and with Valentine’s Day just around the corner, what better time to show some love for our undead brethren?  Beginning at 10 a.m. ET Saturday, AMC kicks off a Walking Dead marathon, starting with the Season 2 opener and running straight through to Sunday’s midseason premiere. As an extra treat, here’s an animated reminder of the show’s origin, the Robert Kirkman comic book monsterpiece that inspired TV’s zombie apocalypse.