A few months after Superman's death, the world still hasn't accepted that he is gone. Now, Supergirl will have to deal not only with the death of her cousin, but also with the fact that she is the last Kryptonian and the main protector on Earth. And in the midst of this situation, a new Superman appears, due to his appearance people call him Cyborg Superman. Now, suspicious, she decides to find out more about the robot.
In the end, Cyborg Superman reveals himself to be Brainiac himself, just waiting for the right moment to attack. Thus, Supergirl ends up facing and destroying the one who destroyed her home planet and assuming herself as the new protector of Earth.
Post-credit scene: Hal Jordan is tasked with going to New Genesis
