"Your cousin has a base, it's a fortress, I guess, in the Arctic. Now, we don't know much about it, but we do know it's a place that he's been able to commune with his Kryptonian ancestors."
Alex Danvers to Kara Danvers[src]

The Fortress of Solitude is Clark Kent's arctic sanctuary.


The Fortress of Solitude is a vast sanctuary hidden somewhere in the arctic. It appears to be built from either crystal or ice.

The Fortress is only accessible via a special key, made from dwarf star material that can only be lifted by super-strong beings. Inside, the compound houses a display of items Superman collected over the years from his adventures, as well as statues of his parents. Also present is some from of interactive computer database.[1]

The facility was maintained by Kelex, who recognized Kal and Kara as well as certain friends such as James Olsen and J'onn J'onzz as friendly, but maintained defensive programming against strangers such as Hank Henshaw.[2]


Clark invited Kara to the Fortress of Solitude several times, though Kara declined as she thought it would remind her too much of Krypton.[1]

It was mentioned by Alex to Kara that Superman uses the fortress as a base where he can communicate with his Kryptonian ancestors.[3]

Kara along with James visited the Fortress to gain information regarding Indigo.[1]

Kara later visited the Fortress seeking out Kal-El's whereabouts and then the purpose of Myriad. Kelex was unable to assist Kara, but somehow the fortress triggered a hologram of Kara's mother, of which informed her of Myriad's programming[4]

The Fortress was again visited by Superman and J'onn J'onzz to find information about Metallo.[5]

After Cadmus captured Supergirl and extracted her blood, they sent Hank Henshaw here to gather information about "Medusa." At first Henshaw was considered to be an intruder up until he used her blood to steal "Medusa." When Kara showed up at the fortress, Kelex considered Kara to be the intruder and attacked her.[2]

Mon-El, Kara and Rhea in the Fortress of Solitude

Kara lured Mxyzptlk here in order to trick him with a false self destruct and made him type the abort code which happened to be his name backwards to force him to go back to his dimension.[6]

Mon-El and Kara decided to talk to Rhea about calling off the bounty on Supergirl's head. She refused and attacked Supergirl with Kryptonite daggers, nearly killing the Girl of Steel. Mon-El interrupted and decided to go with his mom to save Kara's life.[7]

Known holographic entities

Known visitors




  • The Fortress of Solitude in the comics, is Superman's sanctuary located in the Arctic. It first appeared in Superman #17 (July, 1942), created by Jerry Siegel and John Sikela.
  • For being Superman's Fortress of Solitude, there seems to be overwhelmingly enough information of Supergirl's parentage present within the holographic memory files.