5x22 "Missing" - (8:00-9:00 p.m. ET) (Content Rating TBD) (HDTV)

BLACK SIREN RETURNS - Black Siren (guest star Katie Cassidy) returns to help Chase (Josh Segarra). Felicity (Emily Bett Rickards) organizes a birthday party for Oliver (Stephen Amell) while Lance (Paul Blackthorne) is furious after Rene (Rick Gonzalez) misses the custody hearing for his daughter. Mairzee Almas directed the episode written by Speed Weed & Oscar Balderrama (#522). Original airdate 5/17/2017.

5x23 "Lian Yu" - (8:00-9:00 p.m. ET) (Content Rating TBD) (HDTV)

DEATHSTROKE, NYSSA AL GHUL, MERLYN AND DIGGER HARKNESS JOIN OLIVER'S BATTLE AGAINST PROMETHEUS - The battle between Oliver (Stephen Amell) and Adrian Chase (Josh Segarra) culminates in a final epic battle on Lian Yu. After recent events, Oliver decides to recruit a group of unlikely allies - Slade (guest star Manu Bennett), Nyssa (guest star Katrina Law), Merlyn (John Barrowman) and Digger Harkness (guest star Nick. E. Tarabay) - to defeat Chase. However, Chase has his own army - Black Siren (guest star Katie Cassidy), Evelyn Sharp (guest star Madison McLaughlin) and Talia al Ghul (guest star Lexa Doig) - and the forces collide in an explosive season finale. Jesse Warn directed the episode written by Wendy Mericle & Marc Guggenheim (#523). Original airdate 5/24/2017.