Jonny Lee Miller Sherlock Holmes Actor Lucy Liu Joan Watson Actor Aidan Quinn Captain Thomas Gregson Actor Jon Michael Hill Detective Marcus Bell Actor Rhys Ifans Mycroft Holmes Guest Star Sean Pertwee Gareth Lestrade Guest Star Tim McMullan DCI Hopkins Guest Star Rufus Wright Lawrence Pendry Guest Star John Owens Priest Guest Star Mark Underwood Langdale Pike Guest Star Robert Doherty Executive Producer, Writer Carl Beverly Executive Producer Sarah Timberman Executive Producer Craig Sweeny Executive Producer, Writer John Polson Director