Ep 11. The Martian Chronicles

Supergirl season 2 episode 11, titled "The Martian Chronicles," follows the aftermath of the devastating attack on J'onn J'onzz, also known as Martian Manhunter, by the White Martians. After being gravely injured, J'onn's life is saved by M'gann M'orzz, a White Martian who has been living on Earth disguised as a Green Martian. She reveals to Supergirl and J'onn that there are other White Martians hiding on Earth and she needs their help to stop them.

Meanwhile, Kara's relationship with Mon-El becomes more complicated when she discovers he has been lying to her about his true identity. The tension between them only increases when Mon-El offers to help J'onn and M'gann, but Supergirl doesn't trust him anymore.

As they work to track down the remaining White Martians, the team learns more about M'gann's past and the reason she left her home planet to live on Earth. They also discover that the White Martians have a nefarious plan that could put all of Earth in danger.

Meanwhile, Alex struggles with her own personal issues when she realizes that she might have feelings for her friend Maggie, who already has a girlfriend. She confides in Kara, who tries to offer her advice and support.

As the team races against time to stop the White Martians and their plan from unfolding, Supergirl must also reconcile her feelings for Mon-El and figure out whether or not she can ever trust him again.

With action-packed fight scenes, heartfelt moments, and surprising twists, "The Martian Chronicles" is an exciting episode that keeps viewers on the edge of their seats. As the season continues to unfold, fans will undoubtedly be left wanting more from this thrilling and emotional series.