Jeremy Brett as Sherlock Holmes

Edward Hardwicke as Dr. John Watson

Simon Williams as Robert St. Simon

Paris Jefferson as Hatty Doran

Joanna McCallum as Flora Millar

Geoffrey Beevers as Insp. Montgomery

Anna Calder-Marshall as Lady Helena / Agnes Northcote

Heather Chasen as Lady Amelia

Bob Sessions as Aloysius Doran

Rosalie Williams as Mrs. Hudson

Mary Ellis as Lady Florence

Phillada Sewell as Lady Mary

Elspeth March as Lady Blanche

Myles Hoyle as Thomas Floutier

Bruce Myers as Gallagher

Robin Hart as Oswald

Peter Graves as George Tidy

Peter Warnock as Moulton

Don Blaylock as Butler

Vincent Worth as Stage Doorkeeper

Aubrey Phillips as Waiter

Joyce Grundy as Esther

Tres Hanley as Alice