Watson showrunner Craig Sweeny reveals there were almost plans for a different character to die in the season 1 finale. Based on the Sherlock Holmes stories, the cast of Watson is led by Morris Chestnut's titular character, who treats patients in Pittsburgh with his unorthodox methods. In a shocking move, the Watson season 1 finale killed off legendary nemesis and principal antagonist James Moriarty (Randall Park). He was ostensibly killed by Watson, via a custom genetic illness, adding to the shock factor of the scene. However, another character could actually have died instead, and was considered in an earlier draft of the episode.

In an interview with ScreenRant, Sweeny revealed that there was a plan to have one of the twins, Adam or Stephens, not make it through their procedure. The finale sees both twins dying from an illness Moriarty created specifically for them and their genes, with the team only...