|Dying Is An Art|
|Season 2, Episode 12 (25)|
|But Fear Itself||Tower of Babel|
- Amy Acker as Brainiac
- Odette Annable as Samantha Merlyn & Reign
- Katie Cassidy as Laurel Queen/Black Canary, Katrina Lance, & Laurel Lance
- Jessica de Gouw as Helena Bertinelli/Huntress
- Colin Donnell as Tommy Merlyn (voice)
- Luke Evans as Bruce Wayne & Bruce Wayne
- Amy Gumenick as Carrie Cutter/Cupid
- Willa Holland as Mia Dearden Queen/Speedy
- Justin Hartley as Oliver Queen (Earth-19)
- Katrina Law as Nyssa Walker
- Caity Lotz as Sara Wayne
- Katie McGrath as Lena Thorul
- Rachel Skarsten as Talia al Ghul (Earth 3)
Special Appearance By
- Neal McDonough as Damien Darhk (Earth-19)
Special Guest Star
- Paul Blackthorne as Kurt Lance
- Antagonist: Damien Darhk (Earth-19)
- The prime versions of Nyssa, Sam, Thea, and Lena do not appear in this episode. Tommy also does not appear but his voice is heard.
- This episode takes place on June 20, 2017.
- The final scene takes place on December 20, 2018.
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