The 4 Night Mega Crossover Event Stars with Supergirl! <br /> <br />As Eliza comes to National City for Thanksgiving, Kara turns to Lena for help when Cadmus unleashes a virus that instantly kills aliens, then is asked by Barry Allen and Cisco Ramon for help with an alien invasion on their Earth. <br /> <br />Director: Stefan Pleszczynski <br /> <br />Writers: Jerry Siegel (based on characters created by), Joe <br />Shuster (based on characters created by) <br /> <br />Stars: Melissa Benoist, Mehcad Brooks, Chyler Leigh
