- "First, you catch me. Then, you break me out. Now, you want to catch me again. Make up your mind!"
- —Lonnie Machin
"Blood Debts" is the tenth and midseason premiere episode of the fourth season of , and the seventy-ninth episode overall. It aired on January 20, 2016.
|Oliver must deal with the devastating consequences of Darhk's last attack. Seeking revenge, Oliver goes on a brutal manhunt looking for Dahrk.|
In flashback, Oliver is brought to the leader along with Taiana and he tells Conklin that he could do as he pleased to Oliver. Oliver is then whipped. After being lashed, Oliver's mystical tattoo lit up, causing the leader to stop Conklin. Oliver then grabs the guys gun and aims it at himself. Oliver then asks for Taiana's safety in exchange for him helping the man. Conklin however spent the whole time telling him it was a bad idea. Oliver and Taiana are then taken to prison. Conklin locks Taiana and Oliver in a cell.
Later, Laurel learns that her dad is seeing Donna Smoak.
Machin heads to Damian's home and holds Damian's wife and daughter hostage. The Green Arrow, Speedy, Spartan, and Black Canary show up to stop him from killing the hostages. Canary and Spartan untie them as Speedy and Green Arrow battle Machin. They split up and Oliver spots Damian from a distance. Instead of going after Machin, Oliver goes after Damian whilst Speedy ties up Machin. Damian uses magic to injure the Green Arrow and then asked after his family. Damian tells him that he could enjoy his time with his family, as a result of the Green Arrow saving his family. Speedy is knocked out by Machin. Afterwards in the arrow cave, they discuss what happened. Thea calls her boyfriend back to her and Laurel's place where they have red wine and kiss.
In a flash-forward, Oliver and Barry talk at the grave before getting into a limo with Felicity. She tells him that he has to kill the killer.
- Stephen Amell as Oliver Queen/Green Arrow
- Katie Cassidy as Laurel Lance/Black Canary
- David Ramsey as John Diggle/Spartan
- Willa Holland as Thea Queen/Speedy
- Emily Bett Rickards as Felicity Smoak
- John Barrowman (credit only)
- Paul Blackthorne as Captain Quentin Lance
Special appearance by
- Audrey Marie Anderson as Lyla Michaels
- Eugene Byrd as Andy Diggle
- Charlotte Ross as Donna Smoak
- Jimmy Akingbola as Baron Reiter
- Alexander Calvert as Lonnie Machin/Anarky
- Parker Young as Alex Davis
- Ryan Robbins as Conklin
- Elysia Rotaru as Taiana Venediktov
- Janet Kidder as Ruvé Adams
Preparation ran from October 20 until October 30, 2015. Shooting ran from November 2 until November 10, 2015.
- Damien Darhk's wife, Ruvé, is named after Neal McDonough's real wife, Ruve McDonough.
- Felicity's paralysis could be the consequence of Barry changing the timeline in "", as he told Oliver that if changing the timeline would result in something happening to right the change.
- Lonnie Machin's teeth are bloody when he is first tied up. However, when Speedy comes to talk to him alone, his teeth are no longer bloody.
- When Oliver first enters Felicity's hospital room, she is facing her left and there are red flowers on the table to her right. Later on when Oliver and Laurel are talking in front of a large window in the room, Felicity is facing towards them, towards her left with the red flowers behind her right shoulder and the door to the room clearly visible on her right side, opposite how Oliver originally entered.
- After her surgery, Felicity is seen in a hospital bed with all the side rails down. No patient, especially one paralyzed from the waist down, is left in bed without at least the top side rails up to prevent the patient from accidentally rolling out of the bed.
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