On Thursday's fall finale ofChicago Med, Dr. Choi (Brian Tee) treats a convict who's arrived at the ER with a stab wound. It appears that he was involved in a prison fight with three other inmates, which resulted in a nasty knife wound to the abdomen. But he still seems to be in good spirits, joking around with Choi and the nurses as they're assessing his condition and explaining that he was only trying to make friends with the three men who attacked him.

However, things are not as they appear to be. In this exclusive clip, Sharon (S. Epatha Merkerson) watches Choi assess the patient while she's chatting with the policemen who brought him in. Once the man is out of earshot, Goodwin gives Choi some disturbing information about his new patient. Looks like Dr. Charles (Oliver Platt) will have to be brought in for a consultation on this one.

The fall finale of Chicago Med airs Thursday at 9/8c on NBC.