The Irregulars: Every Star Slated For a Role in Netflix's Sherlock Holmesian Drama

Pierreson is set to play a new, darker version of Dr. Watson. So far, he's built a steady career alternating between TV and movies, including several British dramas. He also appeared in Netflix's The Witcher as Istredd, and he has something in common with one of his co-stars: like Darci Shaw, he had a role in the film Judy.