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- "Your best friend thinks she is your enemy. And the worst part? It's all your fault."
- —Mr. Mxyzptlk on Kara Danvers's relationship with Lena Luthor[src]
was renewed for a fifth season by The CW on January 31, 2019. It premiered on October 6, 2019, and was planned to consist of 22 episodes. However, the number of episodes was changed to 20 due to Melissa Benoist's pregnancy and later to 19 due to production shutting down indefinitely on March 13, 2020 as a preventive measure for the ongoing COVID-19 coronavirus pandemic.
- Melissa Benoist as Kara Danvers/Supergirl
- Mehcad Brooks as James Olsen/Guardian
- Chyler Leigh as Dr./Director Alex Danvers
- Katie McGrath as Lena Luthor and Lena Luthor's mother
- Jesse Rath as Director Querl Dox/Brainiac 5
- Nicole Maines as Nia Nal/Dreamer
- Azie Tesfai as Dr. Kelly Olsen
- Andrea Brooks as Eve Teschmacher and Hope
- Julie Gonzalo as Andrea Rojas/Acrata
- Staz Nair as William Dey
- LaMonica Garrett as Mar Novu/The Monitor and Mobius/Anti-Monitor (voice)
- David Harewood as J'onn J'onzz/Martian Manhunter and Hank Henshaw
- Phil LaMarr as Malefic J'onzz
- Ellexis Wejr as Mallory
- Kari Wahlgren as Hope (voice)
- Nick Sagar as Russell Rogers/Rip Roar
- Cara Buono as Gamemnae/Gemma Cooper
- Mitch Pileggi as Rama Khan
- Jon Cryer as Lex Luthor
- Jeremy Jordan as Winn Schott/Computer Lad/Toyman and Winn Schott/Toyman
- Thomas Lennon as Mxyzptlk
|#||Episode name||Directed by||Story by||Teleplay by||Original airdate|
|1||""||Jesse Warn||Derek Simon & Nicki Holcomb||October 6, 2019|
|Kara is surprised to find that CatCo has a new owner who has brought in a star reporter. New couples emerge and explore their budding relationships while J'onn J'onzz receives an unexpected visitor.|
|2||""||David McWhirter||Dana Horgan & Katie Rose Rogers||October 13, 2019|
|Supergirl, Alex, and Brainiac thwart an alien attack while William investigates Kara. J'onn J'onzz and Kelly use Obsidian tech to solve a problem.|
|3||""||Eric Dean Seaton||Lindsay Sturman & J. Holtham||October 20, 2019|
|Kara attempts to mend her relationship with Lena. J'onn J'onzz takes a deep dive into his memories while Kelly tries to help an old friend.|
|4||""||David McWhirter||Jay Faerber & Jess Kardos||October 27, 2019|
|Kara's investigation into William Dey's "criminal" activities results in the shocking revelation he is not who she thinks. Meanwhile, the conflict between Malefic and J'onn J'onzz reaches a boiling point, and Alok confesses his personal problem about working alongside Supergirl.|
|5||""||Alysse Leite-Rogers||Rob Wright & Daniel Beaty||November 3, 2019|
|On the eve of the worldwide launch of Andrea Rojas's VR contact lenses, Kara and William team up on an investigation that exposes a terrorist plot. Kelly and Alex celebrate an anniversary, but Alex's safety is in jeopardy.|
|6||""||Shannon Kohli||Dana Horgan & Nicki Holcomb||November 10, 2019|
|While a new villain is under arrest at the D.E.O., Supergirl uses him to try and understand who is responsible for the recent attacks. Meanwhile, Andrea and Lena think back on their tumultuous past.|
|7||""||Andi Armaganian||J. Holtham & Katie Rose Rogers||November 17, 2019|
|Supergirl finally learns the truth about Lena while tangling with Leviathan. J'onn J'onnz makes a discovery about his brother's whereabouts.|
|8||""||Marcus Stokes||Lindsay Struman & Jess Kardos||December 1, 2019|
|Supergirl’s struggle against Leviathan reaches a boiling point as she faces off against Rama Khan. Meanwhile, as Lena and Hope work to launch Project Non Nocere, Hope proves to be an invaluable asset to Lena.|
|9||""||Jesse Warn||Robert Rovner & Marc Guggenheim||Derek Simon & Jay Faerber||December 8, 2019|
|The Monitor sends Harbinger to gather the worlds' greatest heroes - Supergirl, the Flash, Green Arrow, Batwoman, White Canary, the Atom and Superman - in preparation for the impending Crisis. With their worlds in imminent danger, the superheroes suit up for battle while J'onn and Alex recruit Lena to help them find a way to save the people of Earth-38.|
|10||""||Tawnia McKiernan||Derek Simon||Nicki Holcomb & Jen Troy||January 19, 2020|
|The subsequent complications from the Crisis leave Supergirl to face a chaotic threat.|
|11||""||David Harewood||Dana Horgan & Katie Rose Rogers||January 26, 2020|
|As Supergirl tries to thwart a Toyman copycat, Winn Schott returns from the future.|
|12||""||Alexis Ostrander||Rob Wright & J. Holtham||February 16, 2020|
|Supergirl helps Winn face his greatest fear. After Alex sets out to find evidence against Lex, Brainy must decide between helping his friend or continuing to secretly work for Lex.|
|13||""||Jesse Warn||Robert Rovner & Jessica Queller||Derek Simon & Nicki Holcomb||February 23, 2020|
|Mxyzptlk returns with a proposition for Kara – what if she could go back in time and tell Lena her secret before Lex did, would things turn out different? Looking back over key moments throughout the series, Kara must decide if she wants to change history to become friends with Lena again. Familiar faces return in this special episode.|
|14||""||Gregory Smith||Lindsay Sturman||Emilio Ortega Aldrich & Chandler Smidt||March 8, 2020|
|Lex tasks Supergirl with protecting Andrea from an anti-tech extremist, but his nefarious purpose goes beyond merely keeping Andrea alive. Meanwhile, Lena moves forward with Non Nocere, with Lex’s help.|
|15||""||Armen V. Kevorkian||Dana Horgan & Jay Faerber||March 15, 2020|
|Nia Nal’s roommate, Yvette, is attacked by a man targeting Dreamer because he doesn’t like that Dreamer is transgender and wants her to quit being a superhero. Determined to protect her community from additional harm, Dreamer refuses to give into his threats and puts herself in the line of fire to stop him. Supergirl stands by Dreamer and enlists additional help from Brainy. Meanwhile, Alex, J'onn and Kelly attempt to rescue a man stuck inside a virtual reality escape room.|
|16||""||Tawnia McKiernan||Rob Wright||Jess Kardos & Mariko Tamaki||March 22, 2020|
|Alex uses a pair of Obsidian contact lenses to visit a virtual National City where she takes on a whole new persona. Meanwhile, Kelly helps William investigate Lex. Supergirl deals with difficult news.|
|17||""||Melissa Benoist||Lindsay Sturman||Katie Rose Rogers & Brooke Pohl||May 3, 2020|
|Lex proceeds to lay an intricate plan to bring Lena closer to him, defeat Leviathan's latest attack, and pit Supergirl and team against Leviathan. It is also revealed how Lex came into power after Crisis.|
|18||""||Avi Youabian||Dana Horgan & J. Holtham||May 10, 2020|
|Supergirl and the team go head to head against Rama Khan and Leviathan. Meanwhile, Lena and Lex must join forces when Project Non Nocere fails, leaving the two siblings in serious danger.|
|19||""||David Harewood||Dana Horgan||Emilio Ortega Aldrich & Nicki Holcomb||May 17, 2020|
|Supergirl realizes that in order to stop Lex and Leviathan she must work with the one person she never thought she’d trust again – Lena. Nia keeps dreaming about Brainy but struggles with what the dreams are trying to tell her. Meanwhile, Brainy realizes there is only one way to stop Lex.|
- On March 13, 2020, production was shut down indefinitely due to the ongoing COVID-19 coronavirus pandemic.
- This was the last season to feature Mehcad Brooks as series regular.
- Mehcad Brooks and LaMonica Garrett are only credited for their respective episode appearances.
- This season had 12 starring roles, making it the largest main cast in a single season across all Arrowverse shows.
- On April 21, 2020, Jon Cryer revealed that the season finale is being rewritten and that it changes his character's fate through the use of footage from the original finale filmed prior to production shutting down.
- This is now the shortest season of with 19 episodes, beating the first season (which had 20) by one episode.
- This is the first season of Supergirl to have only one main antagonist, Gamemnae.
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