The penultimate episode saw the return of Reign and a couple of call back lines to Superman IIbr br Supergirl learns the true depth of Serena's nefarious plans for Earth. Supergirl, Mon-El and Alura must devise a plan to stop her before Serena gets to Earth. J'onn prepares to say goodbye to his father.br br Director: Armen V. Kevorkianbr br Writers: Jerry Siegel (based on characters created by), Joe Shuster br (based on characters created by) | 8 more credits »br br Stars: Melissa Benoist, Mehcad Brooks, Chyler Leighbr br Supergirl Warner Bros. Television Entertainmentbr br TM & © 2018 Warner Bros. Entertainment Inc. All rights reserved.