- "Lena, I'm asking you as a friend."
- "We're not friends."
"We used to be."
- —Andrea Rojas and Lena Luthor on the status of their friendship
- Melissa Benoist as Kara Danvers/Supergirl
- Chyler Leigh as Alex Danvers
- Katie McGrath as Lena Luthor and Lena Luthor's mother
- Jesse Rath as Querl Dox/Brainiac 5
- Nicole Maines (credit only)
- Azie Tesfai (credit only)
- Andrea Brooks as Hope
- Julie Gonzalo as Andrea Rojas/Acrata
- Staz Nair as William Dey
- David Harewood as J'onn J'onzz
- Rahul Kohli as Jack Spheer
- Nick Sagar as Russell Rogers/Rip Roar
- Steven Bauer as Bernardo Rojas
- Alexa Najera as Young Andrea Rojas
- Lucy Loken as Young Lena Luthor
- Patti Allan as Margot
- Duncan Fraser as a Leviathan messenger
- Shawn Ahmed as Aide
- Jan Bos as Governor Tom Harper
- Miguel Castillo as Guide
- Lynn Colliar as Newscaster
- Amanda Gray as DEO Agent #2
- Samantha Davis as 4 Year Old Lena
- Arran Henn as News Anchor #2
- Kelvin Lum as DEO Agent #1
- Ryan Mah as Officer
- Sonia Sunger as News Anchor
- This is the first episode of the series to not feature Azie Tesfai (Kelly Olsen) after being promoted to a series regular.
- There is no Mount Helena Boarding School However, there is a private school Mount Helena Primary School in Australia.
- Jon Cryer makes an uncredited appearance as Lex Luthor.
- This episode included a large number of flashbacks including:
- When Lena Luthor decided to move to National City after Supergirl stopped the Myriad attack in "".
- When Supergirl and Superman saved Lena Luthor in ""
- Lex Luthor telling Lena that Kara Danvers in Supergirl in "".
- Lena Luthor watching Supergirl save a school bus on the news in "".
- This episode also includes a flashback with-in a flashback from ""
- In a flashback;
- Supergirl saved the school bus in "", 10 weeks ago, however, the episode claimed 2 weeks later Lena Luthor called Andrea Rojas into her office to negotiate selling CatCo Worldwide Media. However, Lena had already sold CatCo in "The Quest for Peace", before Supergirl saved the school bus.
- The flashback of Lena and Andrea met each other takes place 15 years ago, although Lena is 26, which would make her only 11 years old at the time. This is impossible, because they would not have been able to pass as 21-year-olds at the bar, if that was the case.
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