|Season 5, Episode 1 (81)|
|Root Cause||Old Friends, New Enemies|
PART 1 OF 2: DISCORD RESURFACES- Three years after their last encounter with Synthetics, Laurel Lance has another run-in with D.I.S.C.O.R.D.. Nyssa Raatko reunites with Ray Palmer under strange circumstances. Helena Bertinelli introduces Thea Queen to Barbara Gordon. Brainiac strikes when the team is most vulnerable.
- Katie Cassidy as Laurel Lance/Black Canary
- Katrina Law as Nyssa Raatko/Nyssa al Ghul
- Jessica de Gouw as Helena Bertinelli/Huntress
- Katie McGrath as Tess Luthor
- Willa Holland as Thea Queen/Speedy
- Chyler Leigh as Alexandra Danvers
- Jane Levy as Barbara Gordon/Oracle
- with Amy Acker as Brainiac
- and Katheryn Winnick as Shane Sonus
Special Guest StarsEdit
- Kristin Kreuk as Evelyn Langstrom
- Deborah Ann Woll as Andrea Beaumont
- with Michael Rosenbaum as President Lex Luthor (Earth-30)
- and Brandon Routh as Ray Palmer/ATOM
- Amy Gumenick as Carrie Cutter/Cupid
- Georgina Haig as Mercy Graves (Earth-16)
- Marie Avgeropoulos as Diana, Princess of Themyscira
- Antagonists: D.I.S.C.O.R.D., Brainiac
- Title Meaning: Ray's evaluation of his relationship with Carrie.
- 1st episode this season to feature all main characters.
- This episode takes place on May 3, 2023.
- This episode takes place 3 years after Control, Part 2.
- This episode is named after the song of the same name by Matthew Mayfield.
- Diana was last seen in Superhero Club.
- This is the 5th season premiere.
- This is the 5th season premiere to feature Laurel, Helena, Thea, and Brainiac.
- This is the 4th season premiere to feature Nyssa, Carrie, and Ray.
- This is the 3rd season premiere to feature E19 Oliver.
- This is the 2nd season premiere to feature DISCORD/Sonus, E1 Alex, Tess, Nyssa Raatko, and E2 Vandal Savage.
- This is the 1st season premiere to feature Andrea, Barbara, and Diana.
- This is the 2nd season premiere to not feature Sara.