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.

　　Follows a pair of siblings who love but distrust each other as they embark on a white-water rafting trip with a small group. One of their friends from childhood turns out to be more dangerous than he appears.