- For the eponymous character, see Laurel Lance (Earth-2).
- "You may not be a Canary, and you still have a long way to go to prove that you're a hero. Take it from someone who knows how hard it can be, and don't screw it up"
- —Laurel Lance to Mia Smoak
After being accused of murder and having her criminal past exposed, Laurel goes full Black Siren and teams up with an old criminal acquaintance, Shadow Thief, to go on a crime spree around Star City. While Dinah aims to bring Laurel in, Felicity refuses to give up on her friend and tries everything to get through to her, even summoning Sara Lance for help. However, Laurel rebuffs all her efforts, forcing the former friends to face off against each other.
- Stephen Amell as Oliver Queen/Green Arrow
- David Ramsey as John Diggle/Spartan
- Emily Bett Rickards as Felicity Smoak
- Rick Gonzalez (credit only)
- Juliana Harkavy as Dinah Drake/Black Canary
- Colton Haynes (credit only)
- Sea Shimooka (credit only)
- Katie Cassidy Rodgers as Laurel Lance/Black Siren/Black Canary
Special guest star
- Katherine McNamara as Mia Smoak/Blackstar
- Andrea Sixtos as older Zoe Ramirez
- Carmel Amit as Aviva Metula/Shadow Thief
- Michael Jonsson as Bear
- After Felicity, Sara, Dinah, and Laurel escape the explosion, Felicity refers to the four of them as the "Birds of Justice" to which Sara replies "something like that". This is a reference to the Birds of Prey which is a mostly female group of heroes usually comprised of Black Canary, Huntress, and Oracle.
- When Oliver first gave Felicity the code name "Overwatch" he joked that "[he] was gonna go with 'Oracle', but it's taken".
- Laurel mentions having a sister who was pregnant at some point previously.
- This episode includes some references to Season 2.
- This is the first time since 's "" where Sara is seen wearing the White Canary suit.
- Felicity described Sara's actions on the Waverider as "Timey Wimey shenanigans", referring to the famous quote from Doctor Who.
- This is the final episode where Earth-2 Laurel uses the moniker Black Siren and the first where she finally starts using her Earth-1 counterpart's moniker, Black Canary.
- The title of this episode refers to Laurel being the lost Canary.
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