Ep 13. For the Girl Who Has Everything

Kara wakes up on her birthday to find herself on Krypton as a young girl, with her mother and father alive and well. She quickly realizes that she's in a dreamlike state where her deepest desires have come true and tries to enjoy her time with her family.

However, Alex, James, and Winn discover that Kara is unconscious and hooked up to a Kryptonian device called the Black Mercy, which creates a virtual reality that keeps its host trapped in a state of pure bliss. They find out that the device was sent by an alien known as Non, who wants to use Kara's weakened state to extract information about Fort Rozz.

As Kara's friends struggle to disconnect her from the Black Mercy, Kara comes to realize that her ideal reality is nothing but a facade and she must return to reality to fight Non and save Earth from destruction. With the help of J'onn J'onzz, they are able to convince Kara to return to her senses.

Kara manages to break free from the Black Mercy's hold and wakes up in the real world, ready to stop Non and his plan for destruction. She and her friends team up to engage in a fierce battle against Non and his army, where Kara's powers are put to the test to save the world from doom.

Ultimately, Kara is able to stop Non from completing his plan, but not before she comes close to losing her life. She emerges from the fight scarred but victorious, with her friends and family by her side to help her heal. They marvel at the strength of her resilience and hope that she will continue to embody the ideals of what it means to be a hero.