Season 4 (Arrow)

The fourth season of premiered on October 7, 2015, on The CW and concluded on May 25, 2016. The season consisted of 23 total episodes during its run.

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 Green Arrow (Oliver Queen)
 * Katie Cassidy as Black Canary (Laurel Lance)
 * David Ramsey as Spartan (John Diggle)
 * Willa Holland as Speedy (Thea Queen)
 * Emily Bett Rickards as Overwatch (Felicity Smoak)
 * John Barrowman as Dark Archer (Malcolm Merlyn)
 * Paul Blackthorne as Quentin Lance

Recurring Cast

 * Neal McDonough as Damien Darhk
 * Alex Kingston as Dinah Lance
 * Adrian Holmes as Frank Pike
 * Cynthia Addai-Robinson as Amanda Waller
 * Audrey Marie Anderson as Lyla Michaels
 * Katrina Law as Nyssa al Ghul
 * Charlotte Ross as Donna Smoak
 * Rila Fukushima as Katana (Tatsu Yamashiro)
 * Amy Gumenick as Cupid (Carrie Cutter)
 * Echo Kellum as Curtis Holt
 * Jimmy Akingbola as Baron Reiter
 * Ryan Robbins as Conklin
 * Parker Young as Alex Davis
 * Elysia Rotaru as Taiana Venediktov
 * Eugene Byrd as Andy Diggle
 * Tom Amandes as The Calculator (Noah Kuttler)
 * Alexander Calvert as Anarky (Lonnie Machin)
 * Adrian Glynn McMorran as Murmur (Michael Amar)
 * Janet Kidder as Ruvé Adams
 * James Kidnie as Milo Armitage
 * Venus Terzo as Dr. Elisa Schwartz
 * Lynda Boyd as Phaedra Nixon

In-Universe Guest Stars

 * Grant Gustin as The Flash (Barry Allen)
 * Matt Ryan as John Constantine
 * Danielle Panabaker as Caitlin Snow
 * Carlos Valdes as Cisco Ramon
 * Ciara Renée as Hawkgirl (Kendra Saunders) / Chay-Ara
 * Megalyn E.K. as Vixen (Mari McCabe)
 * Casper Crump as Vandal Savage (Hath-Set)
 * Falk Hentschel as Hawkman (Carter Hall) / Khufu
 * Emily Kinney as Bug-Eyed Bandit (Brie Larvan)

Soundtrack
On September 30, 2016, an album consisting of incidental music from the season was released digitally on Spotify and Amazon Music.