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 Actor Susanna Thompson Moira Queen Actor Paul Blackthorne Detective Quentin Lance Actor Caity Lotz Sara Lance , The Canary Guest Star Robert Knepper William Tockman , Clock King Guest Star Alex Kingston Dinah Lance Guest Star Bex Taylor-Klaus Sin Guest Star Russell Porter Sin's Father Guest Star Curtis Caravaggio Eddie Walczak Guest Star Tig Fong Certo Guest Star Greg Berlanti Executive Producer Marc Guggenheim Executive Producer Andrew Kreisberg Executive Producer David Nutter Executive Producer Nick Copus Director Wendy Mericle Writer Beth Schwartz Writer