Ahead of the Season 4 premiere and the upcoming spinoff Neagley, Prime Video has announced new cast members joining Reacher for Season 5. The television series is based on the best-selling Jack Reacher book series by author Lee Child. Season 4 already added additional cast members, but four new season regulars will be joining the cast for Season 5. Who are they? Reacher Season 4 officially premieres Wednesday, August 12 at 3:01 a.m. If you aren’t a Prime Video subscriber yet, you can get started with a 30-day Amazon Prime free trial, including Prime perks like the Prime Video streaming service, free two-day shipping, exclusive deals, and more.