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 Grant Gustin Barry Allen Guest Star Bex Taylor-Klaus Sin Guest Star Kevin Alejandro Sebastian Blood , Brother Blood Guest Star Celina Jade Shado Guest Star Caity Lotz Sara Lance Guest Star Summer Glau Isabel Rochev Guest Star Jesse Hutch Officer Daily Guest Star Dylan Neal Dr. Anthony Ivo Guest Star Graham Shiels Cyrus Gold Guest Star John Barrowman Malcolm Merlyn Guest Star Keri Adams Bethany Snow Guest Star Jordan Schartner Carl Guest Star Greg Berlanti Executive Producer, Writer Marc Guggenheim Executive Producer Andrew Kreisberg Executive Producer, Writer David Nutter Executive Producer Michael Schultz Director Geoff Johns Writer