'Chicago Med' season 2 spoilers, plot news: Dr. Rhodes gets challenged by his new mentor; Dr. Choi runs new program in hospital to help corpsmen

Dr. Rhodes (Colin Donnell) will continue to grieve after the death of Dr. Downey (Gregg Henry), and the arrival of his difficult new mentor Dr. Latham (Atto Essandoh) will start shaking things up in "Chicago Med" season 2.

Thursday's premiere saw Dr. Rhodes as he got off on the wrong foot with his new boss Dr. Latham, who bluntly asked him if he killed Dr. Downey.To make matters worse, Dr. Latham revealed that Dr. Rhodes wasn't his first choice for the fellowship. Later during surgery, Dr. Rhodes questioned his supervisor and he was yelled at by Dr. Latham in the middle of the operating room. As the other staff members stared in shock, Dr. Latham simply said: "I'm not upset," before getting back to his work.

"It's very different from what the Downey/Rhodes relationship was," Donnell told TV Line. "It's a lot more friction-filled." Known as the "Golden Boy," Dr. Rhodes will now be "dealing with having to actually prove himself. He's actually having to really work towards making sure that he can live up to the expectations," he added.

Meanwhile, Dr. Choi (Brian Tee) adopted a parrot last season to help him deal with his PTSD. After being promoted as the hospital's chief resident this season, Will Halstead (Nick Gehlfuss) is now his superior and his main task is to oversee all the other residents as well as the medical students. Although his PTSD will continue to affect him, it will surface in a  more subtle way in season 2. "We want to move him past that and develop him in some other ways emotionally," co-showrunner Andrew Schneider told TV Guide.

He further added that part of those developments include Dr. Choi leading a new program in which corpsmen are invited to the hospital to practice treating gunshot wounds and get more medical knowledge they can use on the battlefield.

"Chicago Med" season 2 airs every Thursday night at 9 p.m. EST on NBC.