Season 4 (Arrow)

The fourth season of Arrow premiered on October 7, 2015 on The CW.

Official synopsis
''After defeating his most formidable foe to date and riding off into the sunset with longtime flame Felicity Smoak, Oliver Queen (a.k.a. The Arrow) left Starling City with the hopes of beginning a new life. But will Oliver ever truly be able to leave behind his past as the Arrow, and, if so, what becomes of the team he has worked so hard to assemble? Will Diggle, Thea, and Laurel be left to continue Oliver’s crusade without him? And with Malcolm Merlyn having ascended to the top of the League of Assassins as the new Ra's al Ghul, is anyone really safe?''

Main cast

 * Stephen Amell as Oliver Queen/Green Arrow
 * Katie Cassidy as Laurel Lance/Black Canary
 * David Ramsey as John Diggle/Spartan
 * Willa Holland as Thea Queen/Speedy
 * Emily Bett Rickards as Felicity Smoak/Overwatch
 * John Barrowman as Malcolm Merlyn/Dark Archer/Ra's al Ghul
 * Paul Blackthorne as Captain Quentin Lance/Detective

Recurring cast

 * Neal McDonough as Damien Darhk
 * Echo Kellum as Curtis Holt
 * Elysia Rotaru as Taiana Venediktov
 * Ryan Robbins as Conklin
 * Jimmy Akingbola as Baron Reiter
 * Charlotte Ross as Donna Smoak
 * Eugene Byrd as Andy Diggle
 * Parker Young as Alex Davis
 * Caity Lotz as Sara Lance/The Canary
 * Brandon Routh as Ray Palmer/The Atom
 * Grant Gustin as Barry Allen/The Flash
 * Audrey Marie Anderson as Lyla Michaels
 * Cynthia Addai-Robinson as Amanda Waller
 * Katrina Law as Nyssa al Ghul/Ra's al Ghul
 * Natasha Gayle as Mesi Natifah/Talibah
 * Tom Amandes as Noah Kuttler/The Calculator

Confirmed plot points

 * The season will follow a lighter tone to that of the third season.
 * In the twenty-first episode,, Noah Kuttler/The Calculator, Lonnie Machin/Anarky and Michael Amar/Murmur will make theirbreturn.