The Return

"Slade. I told myself I wasn't going to come down here. That I never needed to see you again. You'll be happy to know I was wrong."

- Oliver greets Slade in his prison

"The Return" is the fourteenth episode of the third season of Arrow and the sixtieth episode overall. It aired on February 18, 2015.

Synopsis
Malcolm puts Oliver and Thea in a dangerous situation that lands them on Lian Yu with Oliver’s former enemy, Deathstroke. A flashback reveals when Oliver and Maseo returned to Starling City to retrieve the Omega bio weapon, and despite being under strict orders from Amanda Waller not to reveal himself to anyone, Oliver looks in on his family, Laurel, and Tommy.

Production
Preparation began December 1 and ran until December 9, 2014. Filming began December 10, 2014 and ran until December 19, 2014.

Trivia

 * After Maseo chastises Oliver for risking people seeing him at Tommy's party, Oliver explains that he pulled his hoodie over his face, to which Maseo remarks that that trick wouldn't work if he smeared grease paint over his face, which is exactly what he did when he first became a vigilante in Starling City before receiving the Arrow mask from Barry Allen.
 * This is the only episode of Arrow in which Starling City appears mostly on the flashback storyline instead of the present storyline.
 * This episode marks Manu Bennett last appearance on the show until Season 5's Missing. Deathstroke later return on Invasion!, but he isn't unmasked.
 * Unlike most episodes in the series, this episode feature some of the present storyline's character in the flashback storyline, like Felicity, Diggle, Laurel, Quentin and Tommy.
 * This is the second episode that Oliver doesn't appear as a vigilante. The first one is The Promise.
 * The grave on Lian Yu where Oliver took the gun from is unknown at the episode because the name is not shown (it's not Yao Fei Gulong's because his grave located near Robert Queen's grave). However, in Season 4's Schism, It's revealed to be Taiana's grave, a main character in the flashback storyline of season 4.