在经历了小丑阿特的万圣节大屠杀后，西耶娜和她的兄弟正在努力重建他们破碎的生活。随着节日的临近，他们试图拥抱圣诞精神，把过去的恐怖抛在脑后。但就在他们以为自己安全的时候，小丑阿特回来了，决心把他们的节日欢乐变成一场新的噩梦。随着阿特释放出他扭曲的恐怖，节日很快就结束了，证明没有一个节日是安全的。

“Bad Monkey” tells the story of Andrew Yancy (Vince Vaughn), who has been bounced from the Miami Police Department and is now a health inspector in the Keys. But after stumbling upon a case that begins with a human arm fished up by tourists, he realizes that if he can prove murder, he’ll be back in. He just needs to get past a trove of Floridian oddballs and one bad monkey.