With a new month comes a new round of content on your favorite streaming platforms. And while there are tons of new movies and TV shows coming to Netflix in September 2025, the Watch With Us team is especially excited about three drama series. There's a brand-new Netflix original, a new season of a thrilling Japanese drama and a cult classic that's making its U.S. debut on the platform. Find out why these Netflix series are at the top of our must-watch list for September. 'Orphan Black' (2013-2017) This sci-fi thriller stars Tatiana Maslany as Sarah Manning - and several other characters.