Question: how many episodes of supergirl is superman in

title: List of Supergirl episodes
text: While Kara is trying to win back National City 's trust , the hot - headed Marine Colonel James Harper ( guest star Eddie McClintock ) begins an investigation into the J'onn affair with Lucy , having re-enlisted into the Army at her previous rank of Major , as his legal assistant . Hank / J'onn J'onzz then tells the backstory about how he first met Jeremiah Danvers ( guest star Dean Cain ) 10 years earlier while he and Hank were on a mission in South America to find him and how J'onn took his identity to oversee the DEO . After her interrogation , the vindictive Lucy implicates Alex with her knowledge about J'onn's real identity . After learning that Hank and Alex are on their way to Project Cadmus , Kara finally tells Lucy that she is Supergirl and convinces her to help rescue Hank and Alex . Hank learns that Jeremiah is still alive , so he and Alex go on the run to find him , but not before manipulating Harper into resigning from the Marines and appointing Lucy as the acting director of the DEO . Meanwhile , Siobhan tries to get revenge on Kara for getting her fired , but gets caught by Winn and discovers that she has the power to sonic scream .