It was recently confirmed that Superman & Lois takes place in its own reality that's completely separate from the Arrowverse. That means heroes like The Flash and Batwoman don't exist in the Man of Steel's world (not the versions we know at least), and the Superman who previously appeared in Supergirl is not the one from this show.
Melissa Benoist ended her time as Kara Danvers after the sixth and final season of Supergirl, though she left the door open to potentially reprising the role down the line.
Now, it appears that could be a cameo in Superman & Lois if comments from Elizabeth Tulloch at Fan Expo Canada are any indication. "We have not heard that rumor about her coming on the show," the Lois Lane actress said. "She has expressed interest to me in doing it and I know that we would love to work with her again, and Grant [Gustin], and everyone else."
So, while the recent rumours Tulloch is referring to might not mean much, it does sound like Benoist has expressed interest in playing Kara again. What take on the Girl of Steel we'd see is hard to say as Diggle's recent appearance has shown just how different these characters can be from reality to reality.
As for Superman actor Tyler Hoechlin, he shared high praise for his old co-star. "Melissa is the sweetest she’s the greatest. I think she was born to play that role. I had so much fun guest starring on the show. [About] the crossovers, you couldn’t say nice enough things about her. She really is the best."
We'll see what happens, but for now, we don't expect to see Supergirl in the series anytime soon. For the most part, it's being treated as a standalone project, meaning crossovers are far from a priority.
As for Benoist, her name has been mentioned a lot lately when it comes to who could play the MCU's Sue Storm in Fantastic Four. There's no indication that the chatter is any more than just that, though!
Would you like to see Supergirl in Superman & Lois? Share your thoughts down in the comments section.