Supergirl traces the origins of a mysterious symbol to an ancient prophecy and the mark of the World Killer, Reign. <br /> <br />Director: Glen Winter <br />Writers: Jerry Siegel (based on characters created by), Joe Shuster (based on characters created by) | 7 more credits » <br /> <br />Supergirl attempts to decipher an ancient glyph from the ancient history of Krypton.
