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Created by Craig Sweeny, who wrote for “Elementary,” “Watson” moves Holmes’ almost-as-famous physician friend into the spotlight.

Said Sweeny: “In writing a medical show, I’m going to task the actor with swimming in an ocean of medical jargon. It takes a commitment. With this show, we’re committed to getting the science right with every medical twist and turn. Correct science has a lot of syllables. Morris is as committed to getting it right on his end as we are in the writing.”

Sweeny, who was an executive producer on “Elementary,” said Chestnut was one of the actors he was thinking about when he was writing the pilot for “Watson”: “It was because of his empathy and intelligence. Everybody in the industry has nothing but glowing words for Morris as a person. He is one of the kindest and most respectful people I’ve ever worked with, as well as a great leader.”

Chestnut, who is also an executive producer of “Watson,” was immediately excited when first presented with the pilot script from showrunner Craig Sweeny.

Craig Sweeny wrote the story as a one-off, with the idea that any newcomer to the “Trek” universe could drop into this story and understand what’s going on.