Sept. 5 (UPI) -- Season 9 of The Walking Dead will pick up 18 months after Season 8 of the zombie-apocalypse drama ended, AMC revealed in an official synopsis Wednesday.
"By making the unilateral decision to spare Negan, Rick upheld the values his late son, Carl, championed in order to build for the future, but created conflict within his group," the cable network said in a press release.
"Now, we see our survivors a year and a half after the end of the war, re-building civilization under Rick's steadfast leadership. It is a time of relative peace among the communities as they work together, looking to the past to forge the future, but the world they knew is rapidly changing as man-made structures continue to degrade, and nature takes over, changing the landscape and creating new challenges for our survivors."
Peace and safety do not last for long, however.
"As time passes, the communities confront unexpected obstacles, danger, and of course, walkers, but nothing quite prepares them for the formidable force they are about to encounter, which threatens the very idea of civilization that our survivors have worked so hard to build," the synopsis teased.
Andrew Lincoln announced last month that he is leaving his role of the heroic leader Rick, although how he will be written off the show remains a mystery. Carl, played by Chandler Riggs, was killed off in Season 8.
Season 9 is to begin Oct. 7.