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- Season 4 overviewOct 7, 2015-May 25, 201623 episodesSeason 4 episodes1. Green Arrow Oct 7, 2015
- Oliver and Felicity's getaway comes to an abrupt end when Laurel and Thea ask for their help.
- 2. The Candidate Oct 14, 2015
- Oliver and Thea are concerned when a family friend plans to run for mayor.
- 3. Restoration Oct 21, 2015
- The tension between Oliver and Diggle puts them at risk when they target Damien Darhk.
- 4. Beyond Redemption Oct 28, 2015
- When Oliver turns to Lance for a favor, he is surprised by what he learns.
- 5. Haunted Nov 4, 2015
- Oliver calls in a favor from John Constantine when things with Sara take a turn for the worse.
- 6. Lost Souls Nov 11, 2015
- Felicity learns that Ray is alive and is being held captive by Damien Darhk.
- 7. Brotherhood Nov 18, 2015
- A shocking revelation complicates the battle between Team Arrow and Damien Darhk.
- 8. Legends of Yesterday Dec 2, 2015
- Oliver and Barry hide Kendra and Carter while they try to figure out how to defeat Vandal Savage.
- 9. Dark Waters Dec 9, 2015
- Oliver moves against HIVE; Malcolm goes to see Thea, leaving her with a warning.
- 10. Blood Debts Jan 20, 2016
- Forced to deal with the brutal consequences of Darhk's most recent attack, Oliver seeks revenge.
- 11. A.W.O.L. Jan 27, 2016
- Diggle must learn to trust his brother when an enemy visits Star City; Oliver adjusts to a new life.
- 12. Unchained Feb 3, 2016
- The team is faced with a formidable enemy known as The Calculator; Nyssa decides to make a move.
- 13. Sins of the Father Feb 10, 2016
- Oliver receives a difficult-to-refuse offer from Nyssa; Thea resists the blood lust.
- 14. Code of Silence Feb 17, 2016
- Oliver and the team learn about HIVE's plan to destroy them; Oliver feels guilty about a secret.
- 15. Taken Feb 22, 2016
- Oliver asks Vixen for help battling Darhk; Thea and Malcolm have an honest conversation.
- 16. Broken Hearts Mar 23, 2016
- Brokenhearted, Cupid returns to Star City to destroy lovers on their wedding day.
- 17. Beacon of Hope Mar 30, 2016
- Brie Larvan turns up at Palmer Tech after breaking out of jail and threatens to kill everyone.
- 18. Eleven-Fifty-Nine Apr 6, 2016
- Oliver and Diggle find out Merlyn wants to break Darhk out of prison; Laurel gets an offer.
- 19. Canary Cry Apr 27, 2016
- The team tries to deal with Laurel's death; Diggle feels guilty about believing Andy had changed.
- 20. Genesis May 4, 2016
- Oliver and Felicity seek a magical solution to defeat Darhk; Diggle goes to confront his brother.
- 21. Monument Point May 11, 2016
- Felicity asks her father, Noah Kuttler, for help after the team discovers Damien Darhk's next move.
- 22. Lost in the Flood May 18, 2016
- Oliver and Diggle work to save Thea; Felicity, Curtis and Noah team up to stop Darhk.
- 23. Schism May 25, 2016
- Oliver unites with a surprising force in the race to stop Damien Darhk and his magic.