Slade returns and asks Oliver for help tracking down his son; the rescue mission gets complicated by a terrible revelation that could shatter Slade's hopes of reunion; Vigilante reappears in Star City.
As Slade continues to uncover clues about his son's last few years, Oliver makes a big decision. Meanwhile, the Green Arrow leads the team into battle against "The Dragon," a villain who is stealing valuable tech in Star City.
Oliver turns to an old friend to help battle Diaz. Meanwhile, Rene is out of the hospital but has a hard time re-adjusting to life as Wild Dog. Also, Lance discovers something shocking about Black Siren.