On today's What to Watch: It's the beginning of the end for The Flash, which returns for its ninth and final season — and Barry has to assemble a team of heroes to thwart a new threat to all of Central City. National Treasure: Edge of History wraps up its season with Jess and her friends trying to escape and protect the treasure. Gina Rodriguez stars on the new series Not Dead Yet as a newspaper obituary writer who sees the ghosts of the people she's writing about. Plus, Hollywood trivia, and entertainment headlines, including news about the future of Yellowstone and whether Matthew McConaughey is joining the franchise, Freddie Prinze Jr and Jennifer Love Hewitt reuniting for a sequel series to I Know What You Did Last Summer, how the creators of Billions are expanding the series with the shows Millions and Trillions, and a preview of The Bear star Ayo Edebiri as Janine's sister on Abbott Elementary. More at ew.com, ew.com/wtw, and @EW on Twitter and @EntertainmentWeekly everywhere else. Host/Writer/Producer: Gerrad Hall (@gerradhall); Producer: Ashley Boucher (@ashleybreports); Writer: Calie Schepp; Editor: Samee Junio (@it_your_sam); Executive Producer: Chanelle Johnson (@chanelleberlin). Learn more about your ad choices. Visit megaphone.fm/adchoices