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- Season 2 overviewOct 10, 2016-May 22, 201722 episodesSeason 2 episodes1. The Adventures of Supergirl Oct 10, 2016
- Supergirl and Clark team up to stop a new threat emerging in National City; a pod crashes to earth.
- 2. The Last Children of Krypton Oct 17, 2016
- Supergirl is seriously hurt when a kryptonite-powered villain attacks National City.
- 3. Welcome to Earth Oct 24, 2016
- Alex and Sawyer investigate an attack on the president; Kara thinks a Mon-El is behind the assault.
- 4. Survivors Oct 31, 2016
- While investigating a murder of an alien, Kara and Alex find an alien fight club run by Roulette.
- 5. Crossfire Nov 7, 2016
- Supergirl battles a ruthless gang that has alien technology; the criminals have a secret mission.
- 6. Changing Nov 14, 2016
- The Guardian comes to help after an alien drains Supergirl's powers; Mon-El considers a new career.
- 7. The Darkest Place Nov 21, 2016
- Guardian tries to clear his name after he's accused of a murder committed by another vigilante.
- 8. Medusa Nov 28, 2016
- Eliza visits for Thanksgiving; Barry Allen and Cisco Ramon seek Kara's help with an alien invasion.
- 9. Supergirl Lives Jan 23, 2017
- Kara and Mon-El are thrust through a portal to another planet where the downtrodden become slaves.
- 10. We Can Be Heroes Jan 30, 2017
- Livewire seemingly escapes prison; Supergirl takes Mon-El with her when Livewire attacks the NCPD.
- 11. The Martian Chronicles Feb 6, 2017
- A white Martian descends on National City to take M'gann back to Mars for punishment as a traitor.
- 12. Luthors Feb 13, 2017
- Metallo breaks out of prison and frees Lillian Luthor; the police blame Lena for Metallo's escape.
- 13. Mr. & Mrs. Mxyzptlk Feb 20, 2017
- A magical imp emerges, and after declaring his love for Kara, begins to wreak havoc on the city.
- 14. Homecoming Feb 27, 2017
- After Jeremiah Danvers is rescued from Cadmus, Mon-El questions him about his sudden return.
- 15. Exodus Mar 6, 2017
- Alex searches for Jeremiah while Kara investigates a series of alien abductions.
- 16. Star-Crossed Mar 20, 2017
- A new villain in National City puts Supergirl on high alert; Maggie tries to help Winn.
- 17. Distant Sun Mar 27, 2017
- A bounty on Supergirl draws aliens to National City; Hank receives an order from the president.
- 18. Ace Reporter Apr 24, 2017
- Lena's ex-boyfriend unveils his scientific breakthrough; Lena asks Kara to attend Jack's conference.
- 19. Alex May 1, 2017
- A kidnapper threatens to kill Alex unless Supergirl releases a notorious criminal from prison.
- 20. City of Lost Children May 8, 2017
- Guardian must intervene when an alien that has telekinetic powers attacks National City.
- 21. Resist May 15, 2017
- Supergirl must decide whether or not to obey the president's orders regarding Rhea's latest actions.
- 22. Nevertheless, She Persisted May 22, 2017
- Supergirl challenges Rhea to battle; Superman returns; Cat Grant offers Supergirl some sage advice.