Summary: A hacker steals information from a cheating website and asks Cat to release it. When Cat refuses, the hacker disrupts the city's infrastructure by interfering with its computer system. The hacker is revealed to be Indigo, who was on Fort Roz, and who enabled Kara to escape the Phantom Zone. Her true plan is to destroy National City with a nuclear missile but her attempt is foiled by Supergirl. Meanwhile, Kara is still mad at Hank and refuses to return to the DEO, although she does eventually, only to be told by Alex that it was she who killed her aunt.
