|Season 6, Episode 17|
|The Grey||Somewhere I Belong|
- Melissa Benoist as Kara Danvers/Supergirl
- Chyler Leigh as Alex Danvers
- Katie McGrath as Lena Luthor
- Odette Annable as Reign
- Tyler Hoechlin as Clark Kent/Superman
- Olivia Wilde as Susannah Russo
- Jenna Dewan as Lucy Lane
- Minka Kelly as Dawn Granger
- Claire Holt as Karen Starr (credit only)
- Michael Rosenbaum as LX-52
- Emmy Rossum as Zaora Dru-Zod
- Mehcad Brooks as James Olsen/Guardian
- with David Harewood as J'onn J'onzz
Special Guest StarEdit
- Rekha Sharma as Vel Nez-Oz
- Antagonist: Honn-Rik
- Karen does not appear in this episode.
- This episode is named after the horror novel of the same name by Darren Dillman.
- This episode takes place on March 11, 2021.
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