Stephen Amell Oliver Queen, Green Arrow Actor David Ramsey John Diggle, Spartan Actor Willa Holland Thea Queen Actor Emily Bett Rickards Felicity Smoak Actor Katie Cassidy Laurel Lance, Black Siren Actor Paul Blackthorne Quentin Lance Actor Echo Kellum Curtis Holt, Mr. Terrific Actor Juliana Harkavy Dinah Drake, Black Canary Actor Rick Gonzalez Rene Ramirez, Wild Dog Actor Grant Gustin Barry Allen, The Flash Guest Star Candice Patton Iris West Guest Star Chyler Leigh Alex Danvers Guest Star Melissa Benoist Supergirl Guest Star Caity Lotz White Canary Guest Star Greg Berlanti Executive Producer Marc Guggenheim Executive Producer, Writer Andrew Kreisberg Executive Producer, Writer David Nutter Executive Producer James Bamford Director Wendy Mericle Writer Ben Sokolowski Writer