'Yellowstone' star Kelly Reilly thinks the series finale will 'probably be beautiful and epic' but she's 'not sure it will be happy' The British actor, who has portrayed Beth Dutton in the neo-Western drama since it debuted in 2018, gave her predictions on how the show will end in a recent behind-the-scenes clip. "The main theme of protecting and sustaining this way of life in this land is the bottom of everything," Reilly said. "So I don't know which way it's going to go but we're in season five, and who knows what's in store." Reilly thinks the conclusion of the smash-hit Paramount Network show will be bittersweet. For the full story on Reilly’s series finale predictions, head to Insider.