What We Leave Behind

"There's two types of every legacy, two versions of what we leave behind. There's the good and then the bad. You just really have a lousy habit of focusing only on the bad."

- Thea Queen to Oliver Queen "What We Leave Behind" is the ninth episode of the fifth season of Arrow, and the one-hundred-and-first episode overall. It aired on December 7, 2016.

Synopsis
After Prometheus attacks Curtis, Oliver realizes Prometheus knows all of Team Arrow's secret identities and is planning to come for them one by one. Felicity and Detective Malone discover a clue that links Prometheus to Oliver's past.

Production
Preparation ran from September 29 until October 10, 2016. Filming ran from October 11 until October 20, 2016.

Trivia

 * Oliver mentions Die Hard as one of his favorite Christmas movies. That movie also happens to be Stephen Amell's favorite Christmas movie in real-life, which he mentioned that the script was an ad-lib, and also got to fill in the blank.
 * This episode marks the first full appearance of "The Hood" since Broken Dolls.
 * This is the first episode to feature flashbacks that takes place during Season 1 instead of the flashback storyline.
 * Oliver and Tommy were mentioned to have been trying to impress Maria Sharapova.
 * The flashbacks in this episode takes place between "An Innocent Man" and "The Odyssey", because in those episodes Diggle is a member of Team Arrow, but Felicity is not.
 * Laurel Lance returns at the end of this episode, although it is unknown as to how she is alive.
 * This will be explained when Arrow returns on January 25th.
 * It's presumed Katie Cassidy was credited in the end credits so her appearance in the episode wouldn't be spoiled.
 * Felicity breaks the fourth wall in this episode; she says "Well, in our town, people who are dead turn out to be secretly alive almost every Wednesday," and new episodes of Arrow air on Wednesday nights.
 * Ironically, Laurel Lance, who supposedly died in Eleven-Fifty-Nine, seemingly came back to life.