It is undeniable that one of the most emblematic elements of Superman The story is his Fortress of Solitude, a symbol that has accompanied the Man of Steel throughout the comics and his various film appearances, including that of James Gunn. Superman (2025). But now DC is turning Kal-El’s once-safe haven into his ultimate nightmare.
Those who followed Dan Slott and Rafael Albuquerque Superman Unlimited The series knows that the story centers on a Kryptonite asteroid flooding Earth, making Superman’s greatest weakness more relatable than ever.
A South American country bears the brunt of the consequences, giving rise to its corrupt president, who also poses as the King of Kryptonite. To make matters worse, issue #6 features President Castilho’s Kryptonian castle, essentially a fortress of Kryptonite solitude.
DC releases Kryptonite version of the Fortress of Solitude
The comic page is from Dan Slott Superman Unlimited #6 (2025) – Illustration by Rafael Albuquerque and Mark Norton
The plot of Superman Unlimited #6 follows Clark, Lois, and their allies as they confront Castilho and his Kryptonite Knights over a recently discovered Kryptonian Solar Crystal, the same type of crystal that built the Fortress of Solitude. Chaos erupts when the crystal falls to the ground, embedding itself and triggering unforeseen consequences.
The crystal’s contact with the ground causes Kryptonite to emerge from the K-saturated green earth. It quickly becomes clear that the crystals do not form randomly but coalesce to form a Kryptonian fortress, reminiscent of the Fortress of Solitude. Castilho seizes the opportunity and claims it as the “Kryptonian castle for the Kingdom of Kryptonite.”
Much like Superman’s iconic fortress, this Kryptonian castle, constructed from a solar crystal, is infused with advanced Kryptonian technology and knowledge. Since knowledge is power, Castilho boldly declares: “Our people affectionately call me the King of Kryptonite, but with this place, I will be the King of Krypton.”
Superman faces his toughest challenge yet as Castilho arms his knights with all the knowledge of Krypton
The comic page is from Dan Slott Superman Unlimited #6 (2025) – Illustration by Rafael Albuquerque and Mark Norton
With all of Krypton’s knowledge at his fingertips, Castilho immediately begins designing Kryptonian. “arm” and advanced armor for his knights. He knows that Kal-El will inevitably attempt to recover the Solar Crystal, because it rightfully belongs to him as the Last Son of Krypton. Every plan and resource is prepared for this inevitable confrontation.
Collecting the Solar Crystal will be anything but easy. Superman now faces enemies armed with nearly unlimited Kryptonite and access to every resource and piece of Kryptonian knowledge imaginable. The new Kryptonian castle makes them even deadlier, giving Castilho and his knights unprecedented power of defiance. Superman.
Superman Unlimited #6 is available now from DC Comics!
- Created by
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Joe Shuster, Jerry Siegel
- First appearance
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Action Comics
