Reversal

"Reversal" is the fourth episode of the sixth season of Arrow, and the one-hundred-nineteenth episode overall. It aired on November 2, 2017.

Synopsis
Just as Oliver starts to get things in order, Black Siren launches another attack on the citizens of Star City.

Production
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.

Trivia

 * The title refers to Oliver and Felicity switching roles where the latter now takes on the role of being a vigilante while receiving help from the former.