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|Season 4, Episode 22|
|Episode Guide Transcript|
You Have Failed This City
Adam Raised A Cain is the twenty-second episode of Arrow Season 4 and the 91st episode overall.
LAUREL COMES FACE-TO-FACE WITH BLACK SIREN- Laurel, Thea, and Sara spearhead the manhunt for Abbot and come across the Black Siren, who has escaped from her cell in S.T.A.R. labs. While Diggle has a heart-to-heart with Oliver about his regression since Laurel's kidnapping, Andrea takes matters into her own hands. Finally, Malcolm meets with Mayor Lord and Nyssa makes her move.
- Stephen Amell as Oliver Queen
- Katie Cassidy as Laurel Lance/Black Canary/Laurel Lance (Earth 2)/Black Siren
- David Ramsey as John Diggle/The Guardian
- Willa Holland as Thea Queen/Speedy
- Katrina Law as Nyssa al Ghul
- Caity Lotz as Sara Lance/White Canary
- Colin Donnell as Tommy Merlyn
- and John Barrowman as Malcolm Merlyn/Ra's al Ghul
- Josh Lucas as Kyle Abbot
- Deborah Ann Woll as Andrea Beaumont/The Phantasm
- Manu Bennett as Slade Wilson
- and Christopher Meloni as Maxwell Lord