Superman had invited Kara there a number of times, but she always refused, afraid of being overcome by nostalgia. It is also mentioned by Kara's sister Alex Danvers that Kara's cousin uses the fortress as a base where he can communicate with his Kryptonian ancestors. Kara finally goes there with James Olsen to look for information about Indigo. In "Myriad", Kara visits the fortress seeking out Kal-El's whereabouts and the purpose of program Myriad. When Kelex refuses to give information to her, the fortress triggered a hologram of her mother of which she explained to her about Myriad's programming. In "The Last Children of Krypton", Superman and J'onn J'onzz visit this place to find information about Metallo. In the episode "The Darkest Place", Hank Henshaw/Cyborg Superman gains access to the Fortress and uses Kara's blood which Cadmus drained from her in order to access the Fortress's archive for information on Project Medusa. In "Medusa", Kara went to the Fortress to find information on Project Medusa and was told everything regarding the project by a hologram of her father. In "Mr. & Mrs. Mxyzptlk", Kara lures Mxyzptlk in fortress in order to trick him with a false self-destruct sequence and make him to type the abort code which happened to be his name backwards to force him to go back in his dimension. In "Distant Sun", Mon-El and Kara decide to talk to his mother Rhea in fortress about calling off the bounty on Supergirl's head. She refused and attacked Supergirl with kryptonite daggers, nearly killing her. Mon-El interrupted and decided to go with his mother to save Kara's life. In "Resist", during Daxamite invasion on Earth, Cadmus and DEO propose an alliance to stop invaders and save Lena Luthor and Mon-El from Rhea. Kara, Lilian Luthor and Hank Henshaw enter the Fortress to activate the Phantom Zone projector to board into Daxamite ship. After saving them, only Lena, her mother and Hank return to Fortress where Lilian betrayed Kara and Mon-El to leave them behind. However, Kara expected her betrayal and her friend Winn Schott Jr. put a bug device on Henshaw prior to rescue operation as a precaution. She activated the device to force him in reactivating the projector to beam Mon-El out of the spaceship, while staying behind to confront Rhea. In "Nevertheless, She Persisted" Kara and Kal-El are taken to Fortress by Alex to be healed after