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|Season 4, Episode 10|
|Episode Guide Transcript|
Acknowledgement of Service
My Demons is the tenth episode of Arrow Season 4 and the 79th episode overall.
POISONOUS FRIENDS- Thea gives solo heroics a try and comes across an escaped Werner Zytle, becoming exposed to a new variant of Vertigo in the process. Oliver continues to wrestle with his conscience while he deals with the return of Helena Bertinelli. Diggle meets with Thea's future roommates and discovers an awful secret. Nyssa kidnaps and tortures Malcolm for information. Elsewhere, Laurel learns more about the "Dark Canary" in her dreams.
- Stephen Amell as Oliver Queen
- Katie Cassidy as Laurel Lance/Laurel Lance (Earth 2)
- David Ramsey as John Diggle
- Willa Holland as Thea Queen
- Katrina Law as Nyssa al Ghul
- Caity Lotz as Sara Lance (hallucinations)
- Deborah Ann Woll as Andrea Beaumont
- Colin Donnell as Tommy Merlyn
- and John Barrowman as Malcolm Merlyn
- Peter Stormare as Werner Zytle/Count Vertigo
- Rachel Skarsten as Talia al Ghul (Earth-3) (flashbacks)
- Maiara Walsh as Penny Tate
- Jessica de Gouw as Helena Bertinelli/Huntress
- with Maria Valverde as Carlotta Rivera (flashbacks)
- and Josh Lucas as Kyle Abbot/The Wolf
- Antagonist: Werner Zytle
- First midseason premiere to not feature Quentin and the second to not feature Felicity.
- First appearance of Rachel Skarsten as the Talia al Ghul of Earth-3. The Earth-1 version of the character previously appeared as a child in the Legends of Tomorrow episode titled Left Behind and will appear in Seasons 5, 6, 7, and 9 as an adult.