Grant Gustin News has gotten a hold of new photos taken from the set of The Flash, which reveal a number of intriguing details for this hit series, as well as Arrow. While it isn't exactly known what episode is being filmed, one would assume that these images, taken earlier today, were from the Season 1 finale. There will be plenty of huge SPOILERS below for both shows, so read on at your own risk.

As you know, Grant Gustin's Barry Allen has been searching for the nefarious Reverse Flash all season, but fans learned long ago that it is actually Harrison Wells (Tom Cavanagh) who is inside the yellow suit. These photos show Barry flanked by Arrow's Oliver Queen (Stephen Amell) in a brand new costume and The Flash's Ronnie Raymond/Firestorm (Robbie Amell), but the most intriguing element is that they are all looking at the Reverse Flash unmasked! This means Barry will find out that his mentor Harrison Wells has actually been his main nemesis all along.

The other major takeaway from these images is that Oliver Queen is clearly wearing a drastically different costume. After surviving his epic battle with Ra's al Ghul (Matthew Nable) in the midseason finale, Oliver is offered a chance to join the League of Assassins by Ra's himself. While we don't know for sure, it seems Oliver has accepted Ra's offer, since the new costume falls in line with the League of Assassins' attire. Finally, ever since Robbie Amell joined The Flash, some fans have been wondering whether or not he will ever get to work with his brother Stephen Amell. As you can see in the photos below, fans will get to see these brothers together on the small screen, although we don't exactly know when yet.

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If these photos are, in fact, from The Flash season finale, then we'll get to see this scene unfold on Tuesday, May 19. It's worth noting that Arrow's Season 3 finale happens six days earlier on Wednesday, May 13. It's possible that Oliver does end up becoming a League of Assassins member in the Arrow season finale, returning a week later in The Flash season finale. But, then again, if he does become a villain, why would he seemingly help Barry take on Reverse Flash? Do you have any theories about what these photos could mean? Chime in with your thoughts, and CLICK HERE to check out more images from the set.