|Control, Part 2|
|Season 4, Episode 20 (80)|
|Control, Part 1||Fire Escape|
PART 1 OF 2: AN UNSUSTAINABLE ILLUSION- As Laurel Lance and Nyssa Raatko take the fight to the Prometheus compound, Thea Queen helps Alexandra Danvers recuperate. Talia al Ghul receives her comeuppance, while D.I.S.C.O.R.D. takes control of her fate. Brainiac makes a startling decision, and Helena Bertinelli returns to Midway.
- Katie Cassidy as Laurel Lance/Black Canary
- Jessica de Gouw as Helena Bertinelli/Huntress
- Katrina Law as Nyssa Raatko
- Willa Holland as Thea Queen/Speedy
- Katie McGrath as Tess Luthor & Lena Luthor
- Chyler Leigh as Alexandra Danvers
- with Amy Acker as Brainiac
- and Katheryn Winnick as D.I.S.C.O.R.D.
Special Guest StarsEdit
- Michael Rosenbaum as Lex Luthor (Earth-30)
- Melissa Benoist as Kara Danvers (vision)
- Jane Levy as Barbara Gordon (vision)
- Deborah Ann Woll as Andrea Beaumont
- Kristin Kreuk as Evelyn Langstrom
- with John Barrowman as Malcolm Merlyn
- and Brandon Routh as Ray Palmer/ATOM
- Antagonists: Tess Luthor, D.I.S.C.O.R.D., Talia al Ghul
- Title Meaning: D.I.S.C.O.R.D. making her first truly autonomous choice.
- Brainiac escapes.
- 5th episode this season to feature all main characters.
- This is the fourth season finale.
- This is the 4th season finale to feature Laurel, Helena, Thea, Kara, Lena, Carrie, Ray, Malcolm, Talia, Evelyn, and Brainiac.
- This is the 1st season finale to feature Nyssa Raatko, E1 Alex, Tess, E10 Lex, Barbara, and Shiva.
- This is the first season finale to not feature Nyssa, Sara, and Bruce.
- 1st appearance of Barbara Gordon in this series (albeit in vision form).
- This episode takes place on January 22, 2020.