Stephen Amell Oliver Queen Actor Katie Cassidy Laurel Lance Actor David Ramsey John Diggle Actor Willa Holland Thea Queen Actor Emily Bett Rickards Felicity Smoak Actor Colton Haynes Roy Harper Actor John Barrowman Malcolm Merlyn Actor Paul Blackthorne Captain Quentin Lance Actor Matt Nable Ra's al Ghul Guest Star Katrina Law Nyssa al Ghul Guest Star Brandon Routh Ray Palmer , The Atom Guest Star Karl Yune Maseo Yamashiro Guest Star Rila Fukushima Tatsu Yamashiro , Katana Guest Star Marc Singer General Matthew Shrieve Guest Star Françoise Yip The Priestess Guest Star Howard Siegel Manny Guest Star Greg Berlanti Executive Producer Marc Guggenheim Executive Producer Andrew Kreisberg Executive Producer David Nutter Executive Producer Wendey Stanzler Director Erik Oleson Writer Ben Sokolowski Writer Brian Ford Sullivan Writer