Arrow

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15. Doppelganger - While Black Siren makes a shocking decision, Oliver and Thea are stunned to hear that Roy Harper is back in Star City, but then they discover the circumstances of his return.

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Series 6

1. Fallout

Oliver is determined to embrace his new role as father to William.

2. Tribute

Oliver balances being the Mayor, the Green Arrow and a father to William.

3. Next of Kin

A rogue ops team led by Onyx breaks into Kord Industries and steals something lethal.

4. Reversal

Just as Oliver starts to get things in order, Black Siren launches another attack.

5. Deathstroke Returns

Slade returns and asks Oliver for help in tracking down his son.

6. Promises Kept

Slade uncovers more clues about his son's last few years.

7. Thanksgiving

Oliver and Felicity celebrate Thanksgiving with William, but the moment is interrupted

8. Crisis on Earth-X, Part 2

Barry Allen and Iris West's wedding brings the gang together.

9. Irreconcilable Differences

Black Siren and Cayden James look to trade Lance's life for a weapon of mass destruction.

10. Divided

Oliver remains confident that he, Felicity and Diggle can stop Cayden James & Black Siren.

11. We Fall

Cayden James ups the ante by launching his plan to take control of the city.

12. All for Nothing

Oliver and Dinah have a major disagreement that endangers the life of one of their own.

13. The Devil's Greatest Trick

Cayden James discovers a secret about the Green Arrow that pushes him over the edge.

14. Collision Course

The two teams disagree on how the best way to handle Black Siren.

15. Doppelganger

Black Siren makes a shocking decision, & Oliver is stunned that Roy Harper is back.

16. The Thanatos Guild

Nyssa Al Ghul returns to warn Thea that a group of renegades are planning to attack her.

17. Brothers in Arms

While Oliver and Diggle face their biggest challenge yet.

18. Fundamentals

In his darkest place yet, Oliver wonders if he has failed at everything.

19. The Dragon

Looking to expand his empire, Diaz and Laurel meet with a coalition of mafia families.

20. Shifting Allegiances

Oliver turns to an old friend to help battle Diaz.

21. Docket No. 11-19-41-73

A familiar face returns and the pressure mounts for Oliver.

22. The Ties That Bind

Oliver struggles with Felicity putting herself in danger.

23. Life Sentence

With a new ally on his team, Oliver engages Diaz in an epic final battle.