Jonny Lee Miller Sherlock Holmes Actor Lucy Liu Joan Watson Actor Aidan Quinn Captain Thomas Gregson Actor Jon Michael Hill Detective Marcus Bell Actor Desmond Harrington Michael Actor Samantha Quan Lin Guest Star Alimi Ballard Don Kohler Guest Star Thomas Keegan Dave Amberlin Guest Star Jamie Jackson Colm Frick Guest Star Alok Tewari Rohan Giri Guest Star Alexandra Silber Chloe Giri Guest Star Josh Bonzie Attendant 1 Guest Star Lukas Hassel The Dutchman Guest Star Jed Peterson Fake Cop 1 Guest Star Jade Wu Elderly Woman Guest Star Jeffrey Omura Kwan Guest Star Robert Doherty Executive Producer Carl Beverly Executive Producer Sarah Timberman Executive Producer John Polson Executive Producer Jason Tracey Executive Producer Robert Hewitt Wolfe Writer Guy Ferland Director