Stephen Amell Oliver Queen Actor Katie Cassidy Laurel Lance Actor Willa Holland Thea Queen Actor Colton Haynes Roy Harper Actor David Ramsey John Diggle Actor Emily Bett Rickards Felicity Smoak Actor Manu Bennett Slade Wilson , Deathstroke Actor Susanna Thompson Moira Queen Actor Paul Blackthorne Detective Quentin Lance Actor Summer Glau Isabel Rochev Guest Star Kevin Alejandro Sebastian Blood , Brother Blood Guest Star Caity Lotz Sara Lance , The Canary Guest Star Celina Jade Shado Guest Star Dylan Neal Dr. Anthony Ivo Guest Star Artine Tony Browne Hendrick Von Arnim Guest Star Adrian Holmes Lt. Frank Pike Guest Star Sean Rogerson Peter Guest Star Keri Adams Bethany Snow Guest Star David Nykl Anatoly Knyazev Guest Star Greg Berlanti Executive Producer Marc Guggenheim Executive Producer, Writer Andrew Kreisberg Executive Producer David Nutter Executive Producer Guy Bee Director Drew Z. Greenberg Writer