Chicago Med will turn the clock back and give a more comprehensive backstory to one of the ED's latest additions. Dr. John Frost (Darren Barnet) might not be the most out-there character, but he's quite interesting. Initially starting his career as a child actor, he transitioned to medicine and became a pediatrician, distinctly noticeable by his steadfast championing of children's right to be involved in decisions regarding their health. He doesn't like discussing his past as a child actor, and Barnet's recent comments in an interview with TV Insider reveal his heartbreaking history. "Frost cannot handle parents mishandling a child in any form — emotionally, medically, et cetera. His parents may or may not be coming back around in his life. They were not the best," the actor said, revealing fraught relations between John and his parents. He previewed their actions and how they might return, saying:

"They stole or used all of his money from his acting days. He’s very much in medical debt. They seem to be very opportunistic as parents, and they may be coming back around under some dire circumstances."

Besides his parents' transgressions against him as a child, Dr. Frost still has connections to the industry. Barnet teased a visit from someone from that period. "There is a figure that is coming back from [the] acting days of my life that will maybe be coming back around that was on a very popular show about singing, I would say, at one point," he said. Barnet remained reticent about who the guest star would be, only revealing that "She was on Glee."