- For the eponymous island, see Lian Yu (Earth-1).
- For other uses of Purgatory, see Purgatory (disambiguation).
- "The name of the island they found me on is Lian Yu. It's Mandarin for purgatory. Now I understand why. The memories, the pain, I've never escaped them. They're always with me, a reminder of what I had to endure with only one thought, one goal-- survive. To save the multiverse, I must become something else. To do that, I have to return to where my journey began-- purgatory."
- —Oliver Queen
Oliver’s mission takes him to Lian Yu where he tries to ignore the repercussions of the looming Crisis until he receives help from an old friend. Meanwhile, a united Team Arrow faces a recognizable villain.
- Stephen Amell as Oliver Queen/Green Arrow
- David Ramsey as John Diggle/Spartan
- Rick Gonzalez as Rene Ramirez/Wild Dog
- Juliana Harkavy as Dinah Drake/Black Canary
- Katherine McNamara as Mia Smoak/Blackstar
- Ben Lewis as Older William Clayton
- Joseph David-Jones as Connor Hawke
Special appearance by
Special guest star
- Audrey Marie Anderson as Lyla Michaels/Harbinger
- Byron Mann as Yao Fei Gulong
- Sebastian Dunn as Edward Fyers
- Tom Cavanagh as Harrison Nash Wells
- Jeffrey Robinson as Billy Wintergreen
- LaMonica Garrett as Mobius/Anti-Monitor (voice)
Preparation ran from September 10 until September 18, 2019. Shooting ran from September 19 until October 1, 2019.
- The title references the English translation for Lian Yu.
- This marks the first appearance of Edward Fyers since the Season 1 finale, "", and his only appearance in the present day.
- Billy Wintergreen also appears for the first time since "" and this marks his only appearance in the present day.
- This is the first appearance of Yao Fei Gulong in the present day; having previously appeared in Season 1 through flashbacks and in "" as a vision in a flashback.
- Interestingly enough, Yao Fei wears his green hood and and his Carbon fiber longbow, both of which he gave to Oliver, instead his army outfit he wore before his death.
- Like "", this episode doesn't have many callbacks to previous seasons, mostly from the Season 1 flashbacks on Lian Yu.
- Like in the comics, Roy loses his arm.
- ↑ "Arrow - Episode 8.07 - Purgatory - Press Release" - SpoilerTV
- ↑ Beth Schwartz (@SchwartzApprovd) - Twitter
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