Enola Holmes and Watson divert from Doyle's source material, so it's only a matter of time until a Sherlock Holmes favorite gets their own spinoff.

The Gist: This is where Dr. John Watson (Morris Chestnut) comes upon his friend and mentor, Sherlock Holmes fighting his archnemesis, James Moriarty. When the two plunge over the falls, locked in combat, Watson dives in after them.

The criminal mastermind in the Sherlock Holmes-verse has been revealed on CBS's "Watson." It's Randall Park in a polo shirt.

CBS ’s new medical drama Watson has already left viewers speechless with its casting reveal of a classic villain. The series, which aired its pilot episode immediately after the NFL AFC Championship between the Kansas City Chiefs and the Buffalo Bills, is a daring spin-off of Arthur Conan Doyle’s fictional detective Sherlock Holmes.

The story includes details from the series premiere of CBS’ drama series Watson. Five and a half years after the end of Elementary, CBS is returning to the world of Arthur Conan Doyle with Watson, which debuted tonight after the AFC Championship game.

Dr. John Watson ( Morris Chestnut ), you’re going to want to keep a close eye on the man closest to you! The Watson series premiere ended with the reveal of who’s playing Moriarty — Randall Park! — when Shinwell Johnson ( Ritchie Coster ), Watson and Sherlock Holmes’ friend who now works as an administrator at the clinic, meets with him.

Morris Chestnut stars as Dr. John Watson in this medical drama that is a warmer, fuzzier version of "House," another Sherlock Holmes-derived series.

Morris Chestnut exclusively told Us Weekly about what Sherlock Holmes fans can expect from his new CBS medical drama 'Watson'

Superficial while sometimes emotional, it can generate a good bit of tension while remaining pleasant on the whole.

The new CBS series 'Watson' surprised viewers with an appearance from Randall Park, who's playing the series' villain.

A new actor has now officially played Sherlock Holmes' Moriarty. In a surprise casting move, Watson reveals Randall Park plays its Moriarty.