Are we feeling the heat, or is that just the sizzle over Jesse Spencer’s return to

Chicago Fire? What’s sparking all this excitement? Well, Chicago Fire’s Season 11

delivered an unexpected treat to fans in Episodes 18 and 22, with Spencer popping

back in as Matt Casey. And now everyone wants more, especially after that bombshell of a finale. From his debut in the very first season to his adieu in Season 10, Casey has had a soft spot in fans’ hearts for some time. When he showed up on screen once more, well, you can bet there was a firestorm of cheering happening in living rooms everywhere. In fact, fans have taken to social media to proclaim their love for Casey leading up to the finale, and it’s safe to say, they’re excited for more of him. They were lighting up Twitter with gifs and counting down the hours. But these cameos have left fans burning with a question: “Is Casey coming back to the squad for good?”

Spencer previously broke his silence and dropped some hints in an interview with NBC Insider, saying, “The idea when I left the show was that if it was appropriate and it would work with the storyline they wanted to do, I would be open—and they would be open—to bringing Casey back.” Spencer teased the fans a bit more, suggesting that Casey might be contemplating a return to Firehouse 51 and possibly rekindling his relationship with Brett (played by Kara Killmer) — who posted some seriously fun teases that reveal what could be the triumphant return of “Brettsey.” But, he left us on a cliffhanger, saying, “We’re gonna have to see…we’ll leave that to the future.”

Oh, the suspense! As for strapping on those firefighting boots again, Spencer seemed to have a blast. “It was actually really smooth,” he told NBC Insider. “It’s like riding a bike, you know? There are familiar faces. I know pretty much all the crew and pretty much all the cast. I had a ball.” Well, we now have even more questions about Matt Casey’s future after the finale. As expected, he and Brett still have feelings for each other despite their other relationships. Though Brett was seeing Dylan, he understandably felt threatened by Casey’s return. Which honestly felt like it was for the best. After revealing that she’s going to be adopting a baby girl, Casey makes an unexpected move. He gets down on one knee, professes his love for her, and proposes. The screen goes black before we get Brett’s answer, though she does look shocked. So there you have it. While the future of Casey on Chicago Fire is still up in the air, Spencer’s comments have certainly turned up the heat on the speculation. We’ll just have to grab some popcorn, tune in, and see where this fire leads in Season 12.