When a mysterious new Deathstroke appears in Star City, Oliver and Team Arrow insist on taking down this villain themselves. Meanwhile, reeling from the loss of one of their own, the future Team Arrow figures out a new way to try and stop JJ.
Reunited with his sister, Oliver and Thea find themselves searching through a familiar maze of catacombs. Meanwhile, John and Lyla partner on a special ops mission.
Oliver, John, Laurel and Tatsu seek out an important person within The Monitor’s plan. Connor has a heart to heart with his brother.
While trying to decipher The Monitor’s mission, Oliver returns to Starling City where he encounters familiar faces. Meanwhile, Mia and William’s team clash with a new foe.