There's a lot of secrecy surrounding Arrow's eighth and final season. But while there's very little known about the story and setting, there have been multiple confirmations of throwbacks to previous seasons. Not only will Moira Queen, Tommy Merlyn and Adrian Chase return for the series' final season, we may even get throwbacks to Season 3 with the return of Katana.And now, we have another mystery to dig into. Series star Stephen Amell has shared a behind the scenes photo from the Season 8 shoot -- a photo he's self-censored, hiding the costume he's wearing.RELATED: Stephen Amell Reveals the Hero He Wants to Team With in Arrowverse's CrisisThe photo appears to be taken in a forest, which some might see as a sign that Season 8 will take us back to Lian Yu, the island where Oliver Queen was marooned for five years. The plot thickens when you dig deeper into the censored costume. Portions of it can still be seen, adding fuel to the theory he's wearing Oliver's Season 1 costume.

The big question remains: are all of these throwbacks flashbacks to prior seasons -- or is there something else going on here?

RELATED: Arrow: John Diggle Jr. Actor Drops Cryptic Tease About Final Season

Returning Tuesday, Oct. 15 at 9 p.m. ET/PT on The CW, Arrow stars Stephen Amell as Oliver Queen, David Ramsey as John Diggle, Rick Gonzalez as Wild Dog, Juliana Harkavy as Black Canary, Katie Cassidy as Black Siren, Katherine McNamara as Mia Smoak, Joseph David-Jones as Connor Hawke and Ben Lewis as William Clayton-Queen.