故事描述一种神秘的疾病侵袭小镇，镇上所有21岁以上的人无一幸免，而21岁及以下年纪的人却安然无恙。因此政府划定了一个直径10英里的隔离区，在这个与世隔绝的区域内，法律和道德都不复存在。秩序缺失让这些年轻人们陷入恐慌之中，他们必须自己为自己而战。
青春生死线 (季节 1)
School's Out 5.4
播出日期: 2015-05-21
运行时间: 45 min
概述: A disease wipes out all the citizens of a town, except for those age 21 and under.
Who's the Boss 5.4
播出日期: 2015-05-28
运行时间: 45 min
概述: The remaining citizens collect the dead bodies to be burned and hope the quarantine will be lifted.
Crossing Lines 5.4
播出日期: 2015-06-04
运行时间: 45 min
概述: The power goes out across Pretty Lake, cutting off all communication.
Love Hurts 5.7
播出日期: 2015-06-11
运行时间: 45 min
概述: A teacher fears she may be the virus' next victim; Chuck institutes a harsh and public punishment.
End of the Rope 5.6
播出日期: 2015-06-18
运行时间: 45 min
概述: While power has returned, the remaining residents of Pretty Lake are without communications.
War 5.4
播出日期: 2015-06-25
运行时间: 45 min
概述: The government arrives in Pretty Lake with a cure; Adam has information that may save lives.
季
集 6
集 6
集 7