On February 16, 2022, the fourth spin-off series of NCIS set in the Australian city of Sydney was announced, to be shown on the Australian Network Ten, and streamed on Paramount+. Shane Brennan has been announced as the showrunner.

　　作为带酷儿元素的唯一一部剧集，《不良行为》由公开出柜华裔女导演Corrie Chen操刀，以4集迷你剧的形式讲述悉尼一所寄宿女校的达尔文生态圈。这些女孩之间有真诚的感情，有暧昧的欲望萌芽，也有等级分明的排挤和霸凌。本剧有望成为澳洲版的《Skins》。