Warning: This post contains spoilers for Supergirl's season 3 finale.
Mon-El's Supergirl narrative comes to a close during season 3 finale as Chris Wood isn't coming back for the show's fourth outing, executive producer Robert Rovner reveals. Introduced in season 2, Mon-El initially had a rocky relationship with the Girl of Steel. But as they continued to work together, the two developed romantic feelings for each other and got involved shortly thereafter. Unfortunately, circumstances forced them apart by the end of the same season. While he came back early on in season 3, him being married to someone else didn't make for the happy reunion that Kara was long hoping for.
Fast track towards the end of Supergirl's season 3 when it seemed like everything is finally going well for the two, they once again hit a snag. Knowing what the future lies and his responsibility to take care of it as a member of the Legion of Super-Heroes, Mon-El decides to leave present Earth, capping off his whirlwind romance with Kara. But unlike their first separation, this one appears to be irrevocable - at least in the foreseeable future.
In an interview with TVLine on the heels of Supergirl's season 3 finale, Rovner confirms that Wood won't be reprising his role as Mon-El in the show's upcoming fourth year. Apparently, "the plan for Chris was always to have him on the show for two years. ...We’ve loved telling Mon-El’s story, as well as the story we’ve told for him and Kara. We hope the fans felt that it was a satisfying conclusion."
Meanwhile, executive producer Jessica Queller further explains the need for Kara and Mon-El to separate again, comparing the two's separation to Casablanca's iconic ending.
"They both have destinies in different times as heroes. What they did was the sort-of Casablanca decision of putting what’s most important to them — which is saving the world — first. It’s a little bittersweet that one destiny is to be a hero in this time and one’s destiny is to run the Legion in another time, but I think they grew a lot from knowing one another. They have respect for one another, and they have a respect for the decisions they respectively made.”
The parting scene between the two may be reminiscent of the classic Humphrey Bogart and Ingrid Bergman film, but the only difference is, the decision to part ways was mutual for Kara and Mon-El, unlike the star-crossed lovers of Casablanca. Interestingly, despite the scene a bit similar to their initial break-up at the end of season 2, this one was a lot less dramatic. While that doesn't make it any less sad, it somehow made it feel final - as if both Kara and Mon-El have accepted the fact that being romantically involved with each other isn't just in the cards for them.
That said, that doesn't mean that Mon-El won't pop back up in future seasons of Supergirl as Rovner said that they'll bring Wood back if the right narrative calls for his return. Furthermore, the fact that he handed Kara her own Legion ring and told her that he'll be there if she needs him are good indications that Mon-El and maybe even Imra will be back, especially since Brainiac-5 is sticking around. Wood's exit follows a series of cast shuffling around for Supergirl, as Jeremy Jordan, who has played the role of Winslow "Winn" Schott since the show's pilot episode, has been relegated to a recurring status. Meanwhile, Jesse Rath has been promoted to series regular following his debut this year.
Supergirl season 4 is expected to premiere later this year.