Stephen Amell Oliver Queen Actor Colin Donnell Tommy Actor Katie Cassidy Laurel Lance Actor David Ramsey John Diggle Actor Willa Holland Thea Queen Actor Susanna Thompson Moira Queen Actor Paul Blackthorne Detective Quentin Lance Actor Colin Salmon Walter Steele Guest Star Byron Mann Yao Fei Guest Star Sebastian Dunn Edward Fyers Guest Star Brian Markinson Adam Hunt Guest Star John Barrowman Malcolm Merlyn Guest Star Mark Ghanimé Dr. Douglas Miller Guest Star Scott Lyster Shane Colvin Guest Star David Milchard Nelson Ravich Guest Star Jeffrey C. Robinson Deathstroke Guest Star Greg Berlanti Executive Producer, Writer Marc Guggenheim Executive Producer, Writer Andrew Kreisberg Executive Producer, Writer David Nutter Executive Producer John Dahl Director