Amazon Prime Video’s latest book-to-series adaptation has just given One Chicago fans a reason to add the series to their watchlists!
Chicago Med alum Brian Tee has joined the cast of Prime Video’s new series The Probability of Miracles, based on the novel of the same name from author Wendy Wunder. Tee joins the cast in a recurring role alongside Melissa Collazo, Henry Eikenberry, Ginnifer Goodwin, Michaela Watkins, Georgia Acken, and Ema Inês.
Tee will be playing Izzie, a soft-spoken head chef known for being both grounded and passionate. His character will be romantically involved with Goodwin’s character Alicia, who is at the center of the series as a single mom who relocates her family to the town of Promise.
At the heart of the story is Alicia’s daughter Campbell Cooper (Collazo), a teen battling terminal cancer, who isn’t sold on the small town of Promise’s legacy for being a place where miracles happen and doesn’t believe in miracles. However, as she spends summer in the mystical town, she comes to find that miracles might be possible after all.
With Tee set to play Alicia’s boyfriend in the show, it seems safe to assume that he’ll have a sizable role in the series, one that could expand should a second season be ordered.
Probability of Miracles marks the third Prime Video series Tee has appeared in since exiting Chicago Med. In fact, his role in the Prime Video miniseries Expats was Tee’s first role following his departure from Chicago Med after eight seasons playing Dr. Ethan Choi. He’d then reteam with Prime Video with a key role in the third season of Reacher.

Probability of Miracles shouldn't make it impossible for Chicago Med to bring Brian Tee back
We’re thrilled to see Brian Tee taking on a new role and have him back on our screens via Prime Video’s Probability of Miracles, but his casting in the show might make it tricky for the Chicago Med team to find a way to bring him back for a cameo in season 12.
Since taking over as showrunner, Allen MacDonald has worked hard to honor the legacy of the show and find fun ways to bring back characters who have exited the show. In his two seasons at the helm, he managed to bring back several notable alums, including Rachel DiPillo as Dr. Sarah Reese, Nick Gehlfuss as Dr. Will Halstead, and Torrey DeVitto as Dr. Natalie Manning.
He’s been adamant on hoping to bring back additional characters from the show’s earlier seasons, with Tee and his frequent scene partner Yaya DaCosta ranking at the top of fans’ wishlists. Ethan and April were a core part of the show’s early seasons, and their love story is one of the best we’ve seen in the show’s run and, honestly, in the entire One Chicago franchise.
Ethan and April were lucky enough to get a happy ending when exiting the show, which helped to ease the pain of losing the duo; however, it left fans wanting more. After seeing Natalie and Will return in season 11 in a manner that allowed the fans to catch up with the pair and get a peek into their lives since leaving Chicago, there has been hope Ethan and April might be next on the list to return.
Tee’s new role could make it a bit more tricky to pull off a return, but it’s certainly still on the table. Probability of Miracles is currently filming, which means it will likely overlap with production of the early episodes of Chicago Med season 12. That said, filming on Probability of Miracles should be complete well before Chicago Med wraps filming on its season, which means we could see Tee potentially return via a guest arc, just likely not in the beginning of the season.
We’d love to see Ethan and April back at Gaffney, and if there is anyone capable of pulling it off, it’s Allen MacDonald!
Chicago Med showrunner hints we've seen the last of one of the show's most disliked characters
The final episodes of Chicago Med season 11 took an unexpectedly darker turn for Dr. John Frost as the season revisited his traumatic experiences growing up as a child actor and his rocky relationship with his parents, who failed to protect him. It all began when Frost’s parents, James and Celeste, showed up in town hoping to reconnect with their understandably estranged son.
Frost would eventually agree to meet with his parents, and he came to learn that his father’s health was in decline due to his MS diagnosis. As the season progressed, Frost would come to learn that his father was not suffering from MS, but rather he had a tumor on his spine which was causing MS-like symptoms. He’d also come to learn that his dad knew about the tumor but didn’t explore treatment out of fear.
By the time Frost found out the truth, his father was no longer eligible for a medical trial which could provide treatment designed to shrink the tumor. Despite their fractured relationship, Frost didn’t want to give up on his dad and agreed to sign on for a Nick of Time reboot series in order to make the money needed to pay for his father’s expensive treatment.
It was clear from the start that Frost did not want to return to acting, but it was a means to an end to make the money needed for his father’s treatment. He was all set to proceed with the project until the reboot’s producer surprised him at lunch with the news that Ainsley, the woman who played his mom on the show and took advantage of Frost as a teen, had been added to the cast.
Upon learning the news, Frost chose to walk away from the reboot which was when he’d come to find out that his father knew about his relationship with Ainsley and never stepped in to protect him. Instead, he turned a blind eye. This led to another fallout between Frost and his father, one that was short-lived as Frost would learn in the penultimate episode of the season that his dad’s treatments were not working and he’d been moved to hospice care.
The season finale saw Frost make peace with his father as he stayed with him through his final hours and remained at his side until his father passed as the finale came to a close.

Jessalyn Gilsig not expected to return for Chicago Med season 12
Needless to say, the back half of the season was particularly trying for Frost in many ways, but it was one that allowed the show to close the book on the past as the show focuses on how Frost will move forward. With the closing of this book, Chicago Med showrunner Allen MacDonald seemed to indicate that we’ve seen the last of a character that quickly became one of the show’s most disliked characters: Ainsley.
While you can truly never say never in the world of television, MacDonald appears to have all but confirmed we’ve seen the last of Ainsley on Chicago Med. In speaking with Parade following the finale, MacDonald noted that while they’ll always make reference to Frost’s past and to Nick of Time and Ainsley, specifically, they’ve closed the book on that—seeming to hint that while Ainsley might come up in conversation, she won’t be popping back up on the show directly.
“There’s a weight lifted off his shoulders. I think the past has always been something he’s run away from, that he thought he didn’t need to deal with it but it was actually weighing him down more because he wasn’t. We’ve spent the last two seasons with him slowly confronting the past and growing from the processing of it, and now I believe next season he’s going to move on,” MacDonald revealed. “There will be other challenges next season for Dr. John Frost, but as far as the past and Nick of Time and Ainsley, those are things we’ll always make reference to, but I feel like we’re closing the book on that, on the past, and now he’s going to move forward.”
As much as we love Jessalyn Gilsig, who was phenomenal in the role of Ainsley, it does make sense for her appearance in season 11, episode 19, “Exit Strategies," to serve as her final episode on the show.
Frost will surely continue to unpack the events of his past in the new season as he works on his relationship with his mom following his father’s death, but we don’t need to see Ainsley back again as it’s time the show began to allow Frost to reclaim his future and move forward. Thankfully, that seems to be the plan, and we’re certainly eager to see what season 12 will bring for Frost as he begins this new chapter in his story!
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