A new vigilante appears in National City and starts killing some of the criminals James secures. Mon-El makes an unsuccessful escape attempt. Lillian demands Kara to arrive at Cadmus by threatening him. Kara arrives and is overpowered by the real Hank, who is enhanced and called the "Cyborg Superman". Winn deduces that the vigilante targets the murderers who were exonerated. The former finds the next target, with James managing to defeat the serial killer, who is arrested. Lillian, whom Kara identifies, forces her to deplete her powers, giving the former the chance to take blood samples of her. Jeremiah saves Kara and Mon-El and helps them escape by staying behind. Kara finally approves the Guardian while Alex finds out about his true identity. Mon-El develops feelings for Kara. Cyborg Superman arrives at the Kryptonian base in the North Pole and uses Kara's blood to trick the system into recognizing him as her, demanding to know about the "Medusa" project. Meanwhile, J'onn begins having hallucinations and finds out about M'gann, whom he locks in the DEO. She warns him that the transfusion will turn him into a White Martian. Alex finally accepts Maggie as just a friend.