Preparation for the series finale of The CW's Arrow is underway, as confirmed by consulting producer Marc Guggenheim.On Twitter, Guggenheim shared a photo featuring the Green Arrow costume from behind in a room surrounded by cameras.

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"First day of prep on the 170th - and final - episode of Arrow," Guggenheim wrote.

The cameras are likely set up to capture a light reference for visual effects artists. Interestingly enough, though, we don’t see the identity of whoever is wearing the Green Arrow costume in the image. While it could simply be Amell filming a new reference shot, it could also be a different actor providing one as well. Given the final episodes take place post-"Crisis on Infinite Earths" and the announcement of Green Arrow & The Canaries commencing filming of its pilot, we don’t know who will be left in the hooded costume when the show ends.

What's also notable is that this suit is different from the one we’ve seen so far. For Season 8, Oliver has been wearing a more streamlined Green Arrow uniform modeled after the Earth-2's version of the hero, Adrian Chase. This suit appears to be the one Oliver began wearing in Season 5, though it may be loaded to bear with additional weaponry on the legs based on the number of thigh straps. Presumably, that suit was simply left behind when The Monitor took Oliver from his home in Season 7’s finale. However, there have been multiple archers and Green Arrows on the show, and the very nature of "Crisis on Infinite Earths" means it could be anybody donning the Emerald Archer’s attire.

The reveal of the finale's prep comes hot on the heels of Amell wrapping on "Crisis," from which we've already seen set footage of a major battle and the last time Oliver Queen interacts with Barry Allen.

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Airing Tuesdays 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.

UPDATE 10/24/2019 10:21 am ET: A previous version of this article incorrectly named Marc Guggenheim as showrunner. This has been rectified to reflect his role as consulting producer on the series.