The premise for Jason Ritter's new ABC series, 'Kevin (Probably) Saves the World,' may seem far-fetched. A man named Kevin meets a celestial being who informs him that he's been chosen by god to save humanity. Ritter says he understands if people aren't sure what to think of the show by its description alone. It airs Tuesdays on ABC at 10 p.m. EST. (Oct. 19)