Thus far, Jesse Spencer has returned for four episodes since his original exit as a series regular on Chicago Fire, returning in the season 10 finale, two episodes in season 11, and one episode in season 12. It’s unclear whether we might see Spencer return in the show’s upcoming season, but the door is open so we can’t rule out an exit.
Spencer first returned in the season 10 finale, “The Magnificent City of Chicago,” in which his character returned for the wedding of Severide and Kidd. It was a return that many fans hopped might happen as it felt wrong for Casey not to be present at the wedding of his longtime friend, and fortunately, Spencer agreed to return for the episode which saw Casey coming back to town to partake in the wedding festivities and enjoy a sweet, though bittersweet reunion with Brett in which the pair seemed to come to an agreement that long distance wasn’t working out as well as they hoped.
Spencer next returned in season 11, episode 18, “Danger Is All Around,” returning to work alongside Kidd as part of a special task force investigating and we discover that he’s still hung up on Brett, hinting at a possible reconciliation between the couple.
Said reconciliation came in the season 11 finale, “Red Waterfall,” when Casey returned to Chicago once again this time with the intention of professing his love to Brett by getting down on one knee and asking her to marry him. This moment seemed to hint that he could perhaps return again in season 12 and that was indeed the case – though Spencer’s return came a bit later than fans expected.
While we learned in the season 12 premiere that Brett said yes to his proposal, Casey didn’t return until later in the season. Spencer last returned to Chicago Fire in season 12, episode 6, “Port in the Storm,” which served as the final episode for Kara Killmer’s Brett. The show tied Brett’s exit storyline into a happy ending for her and Casey as their wedding day arrived and with it came Spencer’s return as Casey. In the episode, we got to see Casey and Brett exchange I Do’s before the couple left Chicago together to head back to Oregon to live together with their family.
Given that Casey and Brett are still alive and well in the One Chicago universe, there is always a chance that we could see Spencer returning as Casey again in future seasons but at the present moment there have been no rumors about a possible return. Still, the show has surprised us before and we’ve yet to have a season without an appearance from Spencer in at least one episode so it’s possible we could see him return in season 13 for a guest appearance or two!
