'Watson' Introduces Irene Adler & Mycroft in a Search for Sherlock DNA

'Watson' Introduces Irene Adler & Mycroft in a Search for Sherlock DNA

Irene Adler is on the scene! The famous literary con artist, who has been played by such fan favorites as Natalie Dormer (Elementary), Lara Pulver (Sherlock), and Rachel McAdams (Sherlock Holmes), is taken on by Danish actor Whoopie Van Raam (most recently seen opposite Jason Statham in The Meg 2), made her first appearance in this week's Watson, and her reputation certainly preceded her. She, John (Morris Chestnut), and Shinwell (Ritchie Coster) had history when they all lived in London; however, now she's found herself in Pittsburgh seeking medical assistance for her son Angus (Sebastian Billingsley-Rodriguez).

This week's episode goes transatlantic, with Alder's ties to London forcing Sherlock to hunt down his older brother, Mycroft. Another significant addition from the canon to the series, Sherlock's older brother, Mycroft Holmes, has been played by actors like Mark Gatiss (Sherlock), Rhys Ifans (Elementary), and Sam Claflin (Enola Holmes). In Watson, he'll be played by Vincent Gale, who Americans will recognize from his turns on Snowpiercer and Midnight Mass.

Helping Irene and her son Angus was only a temporary distraction for John, who was still obsessed with having discovered that Moriarty (Randall Park) was still alive in last week's episode. The professor has been switching out John's meds, causing him to have hallucinations. John believes that his pharmacist is behind the switch, but he comes dangerously close to figuring out that Shinwell is also working for the professor.