Deathstroke (Manu Bennett) returns and asks Oliver (Stephen Amell) for help in tracking down his son. When they learn Joe (guest star William Franklyn-Miller) has been taken hostage by mercenaries, their mission to save him gets complicated by a terrible revelation that could shatter Slade's hopes of reunion forever. Meanwhile, Vigilante reappears in Star City.

Joel Novoa directed the episode written by Ben Sokolowski & Spiro Skentzos (#605).