As the end of our two-part Slade saga draws to a close, the stakes rise for both Slade and Oliver, as they face off with unexpected villains in the attempt to save his son Joe, interspersed between flashbacks highlighting the origin of Slade's previous vendetta against Oliver. Meanwhile, back in Star City, Diggle's past decisions come back to haunt him, as Richard Dragon is introduced as a new foe for the team.