- "Well, then what would I say to you in this situation?"
- "You would tell me that when I - you - freed Cayden James, I did it because at the moment at that time in your heart, you thought it was right."
- —Oliver Queen advising Felicity Smoak on her past mistake
"Reversal" is the fourth episode of the sixth season of , and the one-hundred-nineteenth episode overall. It aired on November 2, 2017.
|Just as Oliver starts to get things in order, Black Siren launches another attack on the citizens of Star City.|
- Stephen Amell as Mayor Oliver Queen
- David Ramsey as John Diggle/Green Arrow
- Willa Holland (credit only)
- Emily Bett Rickards as Felicity Smoak
- Echo Kellum as Curtis Holt/Mr. Terrific
- Rick Gonzalez as Rene Ramirez/Wild Dog
- Juliana Harkavy as Lieutenant Dinah Drake/Black Canary
- Katie Cassidy as Laurel Lance/Black Siren
- Paul Blackthorne (credit only)
- Fraser Aitcheson as Chains
- Dexter Bell as Security Guard
- Graham Coffeng as Amnesiac
- Jan D'arcy as Patron
- Chad Ellis as Jackson Klimavich
- Paniz Zade as Jenny
Preparation ran from August 2 until August 11, 2017, with a break on August 7 for British Columbia Day. Shooting ran from August 14 until August 24, 2017.
- Black Siren's sonic scream sign can be heard in the opening title card sequence.
- According to showrunner Wendy Mericle in the "Inside Arrow" featurette, the title refers to Oliver and Felicity switching roles, where the latter now takes on the role of being a field operative while receiving help from the former.
- Laurel's short brunette wig that she uses as a disguise features a nod (or rather reverse look) to Black Canary's appearance in the comics; prior to dying her dark hair blonde, Dinah Laurel Lance used to wear a long blonde wig to hide from her enemies.
- Oliver and Felicity mention their first date three years ago, referencing the events of "".
- When commenting about Black Siren's style of murder and seduction of victims, Curtis states that "Black Siren turned Black Widow". This is a reference to the superheroine Black Widow from Marvel Comics who is an operative of S.H.I.E.L.D..
- Curtis is also referencing the mating behavior of black widow spiders.
- While he and Felicity were talking about their own love lives, Curtis mentioned Upswipz.
- Ray Palmer used to work for the dating app in the episode "".
- Curtis references the film Planes, Trains and Automobiles when he said that the internet controls "planes, trains and automobiles".
- This is the first episode to introduce Cayden James on-screen, as he appeared unseen in "".
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