Sole made her first and only significant appearance in X-Men: The Hidden Years #4 (March 2000). She was created by the legendary writer and artist John Byrne, who helmed the entire Hidden Years series. The series itself holds a unique place in Marvel history. Launched in 1999, its purpose was to retroactively fill the narrative gap between the original X-Men #66 (March 1970), which ended the original run, and Giant-Size X-Men #1 (May 1975), which introduced the “All-New, All-Different” team. For five years in real-world publication time, the original X-Men team's adventures were relegated to reprints. Byrne's Hidden Years sought to chronicle what the founding members—Cyclops, Marvel Girl (Jean Grey), Angel, Beast, and Iceman—were doing during that period. Sole's creation was a direct product of this narrative goal. Byrne used the series to explore darker, more mature themes and introduce characters who reflected the growing complexity of the mutant metaphor. Sole embodies the concept of a mutant whose powers are not merely inconvenient but are a fundamental barrier to human connection. Her story is a quintessential “monster with a tragic heart” narrative, a classic trope that the X-Men franchise has frequently explored, but rarely with such a definitive and hopeless conclusion. Her creation provided a street-level, deeply personal threat that contrasted with the cosmic-level villains like Magneto or the Sentinels the X-Men often faced.
Sole's origins are deeply intertwined with the formation of the Morlock community in New York City. Her real name and life before her mutant powers manifested are unknown, a detail that underscores how completely her condition erased her former identity. At some point during her adolescence, her latent X-gene activated, bestowing upon her a terrifying and uncontrollable power: the ability to drain the life essence, or “soul,” of any living being she physically touched. This was not a power she could wield; it was a constant, active curse. The briefest brush of her skin against another person's resulted in the victim instantly falling into a permanent catatonic state, their mind and spirit seemingly erased, leaving behind only a breathing, biological shell. Wracked with guilt and terror over what she had done to family or friends—details of which remain hauntingly unspoken—she fled from society. She was eventually found or drawn to the underground, finding refuge in “the Alley,” an abandoned network of subway and sewer tunnels beneath Manhattan that would become the central nexus of the Morlock society under the leadership of Callisto. In this subterranean world, she was given the name “Sole” due to her enforced solitude. Even among the other outcasts, she was an outcast's outcast. While other Morlocks could commiserate and form bonds over their shared rejection by the surface world, Sole could never experience the comfort of a reassuring touch, a handshake, or an embrace. She existed in a self-imposed quarantine, a lonely figure wrapped in heavy clothing to prevent accidental contact, her very existence a source of fear and sorrow for the burgeoning community. Her tragic state eventually came to the attention of the original X-Men when citizens began disappearing near the tunnels, their catatonic bodies discovered by the authorities. This prompted an investigation that led the young heroes directly into the dark, hidden world of the Morlocks and into a tragic confrontation with Sole herself.
Sole does not exist in the Marvel Cinematic Universe (MCU). The character, her specific powers, and the storyline from The Hidden Years have not been adapted into any film or television series within the MCU canon. Furthermore, the Morlocks as a cohesive, organized community have yet to be introduced in the MCU. While the concept of mutants was officially introduced at the end of Ms. Marvel (with Kamala Khan) and further explored in Doctor Strange in the Multiverse of Madness (with Professor X of Earth-838) and The Marvels (with Beast of an alternate reality), their societal impact and the formation of fringe groups remain unexplored territory. Speculative Adaptation: Should the MCU choose to introduce a character like Sole, it would likely be as part of a larger story establishing the Morlocks. Her character arc could serve as a powerful and dark entry point for audiences to understand why a mutant underground would be necessary. In a cinematic context, her powers could be visualized with chilling subtlety—a brief touch followed by a character's eyes glazing over, their life instantly extinguished without a visible energy effect, making the result all the more horrifying. An adaptation could lean heavily into the body horror and psychological thriller aspects of her condition. She could be presented not as a villain, but as the center of a mystery the X-Men must solve. A potential storyline could see her being manipulated by a more malevolent mutant (like a proto-Mister Sinister or a desperate Callisto) who seeks to weaponize her devastating ability. This would allow the MCU to explore the ethical gray areas of the mutant struggle, posing the question: what do you do with a person who is not evil, but whose very existence is a lethal threat?
Sole's abilities are psionic in nature but manifest through a lethal physical touch. Her entire power set is a singular, devastating, and uncontrollable curse.
Sole is the epitome of a tragic figure. Her personality is defined by fear, sorrow, and a desperate longing for connection. She is not malevolent; in fact, she is terrified of her own capacity for harm. During her encounter with the X-Men, she was portrayed as deeply frightened and defensive, lashing out not from malice but from a desperate desire to be left alone to prevent further tragedy. She is intelligent and self-aware enough to understand the horror of her situation, which only deepens her despair. The name “Sole” is a perfect descriptor: she is utterly, and perhaps eternally, alone.
As Sole is not present in the MCU, her capabilities can only be theorized as a potential adaptation.
Due to her extreme isolation and limited appearances, Sole's network of relationships is incredibly small and defined more by brief, impactful encounters than by sustained alliances or rivalries.
Jean Grey is arguably the most significant person Sole ever interacted with. When the X-Men confronted her in the Morlock tunnels, it was Jean's telepathic abilities that turned a potentially violent encounter into a moment of profound empathy. While Cyclops and the others saw a dangerous threat, Jean was able to psionically reach past Sole's fear and perceive the immense pain and loneliness within her. Jean did not “fight” Sole. Instead, she used her telepathy to understand the nature of Sole's curse. Realizing that Sole could not control her power and that a cure was beyond her capabilities, Jean offered the only solace she could. She reached into Sole's mind and helped her construct a “safe place”—a permanent, peaceful psychic landscape within her own consciousness where she could retreat and exist without fear of harming others. She then helped guide Sole into this mental sanctuary, effectively placing her in a self-induced, peaceful coma. This act of compassion was not a victory in the traditional sense, but a mercy that defined the X-Men's highest ideals.
Sole does not have a traditional arch-nemesis. She is not opposed by a supervillain or an ideological rival. Her one true enemy is the uncontrollable X-gene that resides within her. Her entire life is a battle against her own biology. Every waking moment is dictated by the need to avoid contact, to suppress the natural human instinct for touch and connection. This internal conflict is far more compelling and devastating than any external foe could be. Her power is the villain of her story, an antagonist that is inseparable from her being, making her struggle one of pure, inescapable tragedy.
Sole's only affiliation is with the Morlocks. This subterranean society of mutant outcasts was the only place in the world where she could exist with a semblance of safety. While they feared her power, they understood her plight in a way the surface world never could. The Morlocks' philosophy is one of survival and mutual protection for those deemed too “different” to survive in human society. Sole represents an extreme case even for them. While many Morlocks were rejected for their physical deformities, Sole was cast out for a power that made her a threat to everyone, including her fellow Morlocks. She was a member of their community, but her condition meant she could never be fully integrated. She was a lonely island even in a sea of outcasts, her story serving as a stark example of the diversity of suffering within the mutant population. Her presence in the tunnels was a constant, grim reminder of how cruel the genetic lottery could be.
Sole's entire known history is contained within a single, powerful story arc.
Appearing in X-Men: The Hidden Years #4-5, this storyline is Sole's definitive and only appearance.
Realizing that there is no easy cure and that Sole cannot be allowed to roam free, Jean makes a difficult and compassionate choice. She offers Sole a permanent escape. Working with Sole's own consciousness, Jean helps her build a beautiful, intricate fantasy world within her own mind—a psychic sanctuary where she can live peacefully, experience friendship and love, and never harm anyone again. With Sole's consent, Jean helps her retreat fully into this mental world, leaving her physical body in the same catatonic state as her victims, but with her mind finally at peace. The X-Men take Angel's inert body with them, with Professor X later helping to restore his consciousness. Sole's fate, however, is to remain in the care of the Morlocks, a living monument to the tragic potential of mutant powers. This event deeply affected the young X-Men, serving as one of their first encounters with a mutant whose problem could not be solved by fighting.
As a minor character with only one appearance, Sole has no known variants in prominent alternate realities like the Ultimate Universe (Earth-1610), the Age of Apocalypse (Earth-295), or the House of X timeline. Her existence is confined to the Earth-616 continuity during a specific, retroactively-written period. However, we can speculate on what her variants might be like in other contexts: