Warning! Spoilers ahead for Chicago Med season 10, episode 6.Chicago Med season 10’s cameo appearance by a Chicago PD character was great, but the series needs to have more extensive crossovers. Chicago Med was spun off from Chicago PD nine years ago. Initially, it featured Jay Halstead’s brother Will as a passionate medical resident who was willing to break the rules to help patients. During this era, there were often full crossovers with other shows in the One Chicago universe.