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 Audrey Marie Anderson Lyla Michaels Guest Star Grant Gustin Barry Allen , The Flash Guest Star Nick Tarabay Digger Harkness Guest Star Danielle Panabaker Caitlin Snow Guest Star Carlos Valdes Cisco Ramon Guest Star Cynthia Addai-Robinson Amanda Waller Guest Star Adam Lolacher Klaus Markos Guest Star Vincent Tong Katsu Cheng Guest Star Marcus Sim Li Khuan Hui Guest Star Greg Berlanti Executive Producer, Writer Marc Guggenheim Executive Producer, Writer Andrew Kreisberg Executive Producer, Writer David Nutter Executive Producer Jesse Warn Director Grainne Godfree Schwartz Writer