|City On Fire|
|Season 3, Episode 24|
|The Fall of Kandor||The Kryptonian Cure|
PART 2 OF 2: PLANETFALL- As Kandor burns, Kara and company attempt to evacuate the city with minimal casualties. As a last resort, J'onn heads into the breach himself to finally destroy Brainiac. Lex activates the "Kryptonian Contingency". The DEO learns they are cut off from communication with New Krypton. Alex helps Maggie and Cat readjust to being back on Earth.
- Melissa Benoist as Kara Danvers
- Chyler Leigh as Alex Danvers
- Jeremy Jordan as Winslow Schott
- Katie McGrath as Lena Luthor
- Laura Benanti as Alura Zor-El & Astra In-Ze
- Zachary Quinto as General Dru-Zod
- Tyler Hoechlin as Kal-El, Cyborg Superman, & Jor-El
- Floriana Lima as Maggie Danvers
- Odette Annable as Samantha Arias & Reign
- Jenna Dewan as Lucy Lane/Superwoman
- with Claire Holt as Karen Starr/Power Girl
- and David Harewood as J'onn J'onzz/Martian Manhunter
Special Appearance ByEdit
- Calista Flockhart as Cat Grant
Special Guest StarsEdit
- Jon Cryer as Lex Luthor
- Peter Facinelli as Max Lord
- Jeffrey Dean Morgan as Ran-Zod
- Mehcad Brooks as James Olsen
- and Helen Slater as Eliza Danvers
- Emmy Rossum as Zaora Dru-Zod
- Amy Acker as Brainiac & Vril Dox
- Tracy Spiridakos as Lesla-Lar
- Chad Lowe as Thomas Coville
- Paige Turco as Lara Lor-Van
- Amy Jackson as Imra Ardeen/Saturn Girl
- Glenn Morshower as General Sam Lane
- Minka Kelly as Lois Lane
- Tamzin Merchant as Lyra Strayd
- Briana Venskus as Agent Susan Vasquez
- Lauren German as President Veronica Banks
- Andrea Brooks as Eve Teschmacher
- Emma Tremblay as Ruby Arias
- Wallis Day as Nyssa-Vex
- with Katheryn Winnick as D.I.S.C.O.R.D.
- and Dianna Agron as Raya Zod-El
- Antagonists: Brainiac, Lucy Lane, Vril Dox, D.I.S.C.O.R.D., Lex Luthor, Sam Lane, Cyborg Superman, Ran-Zod (flashbacks)
- 9th episode this season to feature all main characters.
- This is the third season finale to feature Kara, James, Alex, Winn, J'onn, Cat, and Clark.
- This is the second season finale to feature Maggie, Lena, Non, Lucy, Max, General Lane, Vasquez, Alura, and Zod.
- This episode is set on June 30, 2020.
- This is the first season finale to feature Brainiac, Lex, Lois, D.I.S.C.O.R.D., Astra, Coville, Lesla, and Karen.