Jonny Lee Miller Sherlock Holmes Actor Lucy Liu Joan Watson Actor Aidan Quinn Captain Thomas Gregson Actor Jon Michael Hill Detective Marcus Bell Actor Nelsan Ellis Shinwell Johnson Actor Chasten Harmon Guest Star Robert Christopher Riley Guest Star Debra Jo Rupp Guest Star Brian Muller Guest Star Peterson Townsend Guest Star Cary Donaldson Guest Star Lee R. Sellars Guest Star Barry Shabaka Henley Guest Star Damian Young Guest Star Opal Alladin Guest Star Edward Carnevale Guest Star Peter Onorati Guest Star Luis Moreno Guest Star Robert Doherty Executive Producer Carl Beverly Executive Producer Sarah Timberman Executive Producer John Polson Executive Producer Jason Tracey Executive Producer Jordan Rosenberg Writer Michael Slovis Director