Reign

CW | 9:00 pm

A show about European royalty seemed like a big swing for a network largely weaned on dramas about the supernatural and superheroes, but this saga managed to have a healthy four-season run. That ends with the series finale, "All It Cost Her … ," in which Mary’s (Adelaide Kane) decision seals not only her own fate but that of her country. Elizabeth (Rachel Skarsten) girds herself for battle, literally, but realizes what she and Mary have in common.