Watch the entire episode with no login here - http://www.cwtv.com/shows/supergirl <br /> <br />Alex gives Kara a pep talk before going out to face a powerful new threat - Reign. <br /> <br />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) <br />Stars: Melissa Benoist, Mehcad Brooks, Chyler Leigh
