A new set photo for Supergirl's 100th episode may give away a major plot development for Melissa Benoist's Kara Danvers.
A photo from the thirteenth episode of Season 5 features Kara in an outdoor press conference opening her jacket to reveal her Supergirl super-suit underneath, as reporters hurry to get a photo of the scene. Commenters on the Twitter thread of @yvrshoots state the scene comes from Supergirl's 100th episode, titled "It's a Super Life," which could mean the historic episode will take place in an alternate timeline or reality.
If this is indeed the main Arrowverse timeline, then this scene could play into the developments from the Season 5 premiere, when Lena Luthor intended to reveal Supergirl's secret identity to the public. Lena recently confessed her plans, so this may be tied to Lena either blackmailing Kara or her doing this to prove a point to Lena as a show of good faith.
"Crisis on Infinite Earths" begins Sunday, Dec. 8 at 8 p.m. ET/PT on Supergirl, then continues in Batwoman on Monday, Dec. 9 at 8 p.m. ET/PT and in The Flash on Tuesday, Dec. 10 at 8 p.m. ET/PT. After the winter hiatus, the crossover will conclude on Tuesday, Jan. 14 in Arrow at 8 p.m. ET/PT and in DC's Legends of Tomorrow at 9 p.m. ET/PT.