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 Grant Gustin Barry Allen , The Flash Guest Star Brandon Routh Ray Palmer Guest Star Matt Nable Ra's al Ghul Guest Star Katrina Law Nyssa al Ghul Guest Star Karl Yune Maseo Yamashiro Guest Star Rila Fukushima Tatsu Yamashiro Guest Star Marc Singer General Matthew Shrieve Guest Star Keri Adams Bethany Snow Guest Star Brandon Nomura Akio Yamashiro Guest Star Greg Berlanti Executive Producer Marc Guggenheim Executive Producer Andrew Kreisberg Executive Producer David Nutter Executive Producer