Complete story — includes the ending
In a flashback to years prior in Afghanistan, Diggle and Lyla are leading a group of Afghan villagers when a wanted man, Gholem Qadir, is identified among them. During an ambush by the rebels, Diggle saves Qadir's life. In the present, Diggle and Lyla are called upon by Waller to lead her "Task Force X", also known as the "Suicide Squad", which consists of Floyd Lawton, Ben Turner, and Mark Scheffer being used as expendable assets. The Squad is sent after Qadir, who has developed a deadly nerve agent. Scheffer attempts to escape and is killed. After saving Qadir's life again through a faked assassination attempt, Diggle is invited to Qadir's home for a party. Once there, Lawton locates the agent and is used as the target marker for a drone strike on the house. Diggle decides to save Lawton while Turner murders Qadir; as a result, the drone misses the house and a Navy SEAL team is forced to destroy the agent. Oliver goes to Waller for help, revealed to have interacted with her in the past. She tells him that A.R.G.U.S. has been tracking a new mercenary called "Deathstroke", whom the pair realize is actually Slade.
Sources and content license
Source and revision history · Adapted from Wikipedia contributors, Arrow season 2. HTML formatting and reference markers removed. · Content license