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Description
Cain Marko is the son of Dr. Kurt Marko, who was an atomic researcher, and Marjorie Marko. Cain's parents separated, and his mother died when he was three. Cain was eventually sent to boarding schools, which he continued to get expelled from. Dr. Marko's wealthy colleague, Dr. Brian Xavier, another atomic researcher, died in an accident, and Dr. Marko eventually married his widow, Sharon Xavier, for her great wealth. On marrying Sharon, Dr. Marko moved into her large Westchester County mansion, and, after yet another expulsion from school, eventually moved Cain in also.

Dr. Marko favored his gentle, smart step-son, Charles Xavier, to his own son, which led to Cain bullying the young Charles and Dr. Marko secretly beating Cain. Cain was abusive to his stepbrother at every opportunity. Charles' telepathic powers began emerging when he was still a boy, around ten, and, on one occasion, he found himself experiencing the anguished thoughts and emotions of Cain; after Cain had been beaten by his father. The inexperienced young Charles could not control or end his contact with Cain's mind at this time. Somehow, Cain sensed that Charles was reading his mind and had discovered his secret shame.

Sharon died shortly thereafter, of a broken heart, leaving Charles to live with his step-father and abusive step-brother. During an argument in Dr. Marko's private laboratory over money, Cain accused him of having a hand in Dr. Xavier's "accidental" death, at the disaster at Alamogordo. Dr. Marko was quick to be steadfast in defending himself, taking Cain by the collar of his coat and yelling at him to "never say that again". Charles was stationed outside the door, however, and overheard the conversation. When Cain realized, he intended to cause a ruckus, by destroying some of his father's chemical experiments, throwing a vial of green liquid that caused similar containers to shatter, spilling the chemicals throughout the laboratory. The collision of the different substances caused a violent explosion that left the lab aflame. Though Dr. Marko managed to rescue both Cain and Charles from the fire, he himself died of smoke inhalation. In his dying words, Dr. Marko begged forgiveness for not saving Dr. Xavier when he had the chance, and telling Charles to keep his powers secret from Cain. Cain was standing over, however, and heard of Charles' gift, which led him to believe that Charles had invaded his thoughts deliberately. From then on, Cain regarded Charles as his enemy.

Cain continued to live in the Xavier mansion, growing increasingly resentful of his step-brother's scholastic and athletic achievements as well as his telepathic powers (which Charles mastered as he grew older), while Charles entered England's Oxford University. Cain even pushed Charles too far one day and the two got into a fight, which Charles easily won. What happened to Marko after he left home was unclear. However, it was known that Cain became a mercenary and was eventually imprisoned in a Third World jail when the revolutionary forces he was fighting for were defeated. In the jail, Cain became friends with a fellow mercenary, Black Tom Cassidy.

Prisoner of the Crimson Cosmos
While attempting to find a pathway back to Earth, Cain made his way to the Dream Dimension and aided Dr. Strange in battling Nightmare to rescue Eternity. After successfully rescuing Eternity, Cain attempted to destroy him and was banished back to the Crimson Cosmos. Due to a number of mystic coincidences, it being Halloween, and his desire for revenge, Cain was briefly returned to Earth, in Rutland, Vermont. The powers that be in the Crimson Cosmos, to teach him an abject lesson, made Cain believe that he was aging rapidly until death. Due to the circumstances of his arrival, Cain was pulled between the Earth dimension and the Crimson Cosmos, while causing chaos in Vermont to regain his youth through hate. Coming to the aid of the citizens of Rutland, the former X-Man Beast, battled Juggernaut, who was winning until he realized that Beast's new beastly appearance was real and not a costume. Due to Cain's hate turning to fear, he began to age again and, before he could perish, another portal appeared, returned Cain to imprisonment, and restored him to life when he was brought back to the realm

Description
Cain Marko is the son of Dr. Kurt Marko, who was an atomic researcher, and Marjorie Marko. Cain's parents separated, and his mother died when he was three. Cain was eventually sent to boarding schools, which he continued to get expelled from. Dr. Marko's wealthy colleague, Dr. Brian Xavier, another atomic researcher, died in an accident, and Dr. Marko eventually married his widow, Sharon Xavier, for her great wealth. On marrying Sharon, Dr. Marko moved into her large Westchester County mansion, and, after yet another expulsion from school, eventually moved Cain in also.

Dr. Marko favored his gentle, smart step-son, Charles Xavier, to his own son, which led to Cain bullying the young Charles and Dr. Marko secretly beating Cain. Cain was abusive to his stepbrother at every opportunity. Charles' telepathic powers began emerging when he was still a boy, around ten, and, on one occasion, he found himself experiencing the anguished thoughts and emotions of Cain; after Cain had been beaten by his father. The inexperienced young Charles could not control or end his contact with Cain's mind at this time. Somehow, Cain sensed that Charles was reading his mind and had discovered his secret shame.

Sharon died shortly thereafter, of a broken heart, leaving Charles to live with his step-father and abusive step-brother. During an argument in Dr. Marko's private laboratory over money, Cain accused him of having a hand in Dr. Xavier's "accidental" death, at the disaster at Alamogordo. Dr. Marko was quick to be steadfast in defending himself, taking Cain by the collar of his coat and yelling at him to "never say that again". Charles was stationed outside the door, however, and overheard the conversation. When Cain realized, he intended to cause a ruckus, by destroying some of his father's chemical experiments, throwing a vial of green liquid that caused similar containers to shatter, spilling the chemicals throughout the laboratory. The collision of the different substances caused a violent explosion that left the lab aflame. Though Dr. Marko managed to rescue both Cain and Charles from the fire, he himself died of smoke inhalation. In his dying words, Dr. Marko begged forgiveness for not saving Dr. Xavier when he had the chance, and telling Charles to keep his powers secret from Cain. Cain was standing over, however, and heard of Charles' gift, which led him to believe that Charles had invaded his thoughts deliberately. From then on, Cain regarded Charles as his enemy.

Cain continued to live in the Xavier mansion, growing increasingly resentful of his step-brother's scholastic and athletic achievements as well as his telepathic powers (which Charles mastered as he grew older), while Charles entered England's Oxford University. Cain even pushed Charles too far one day and the two got into a fight, which Charles easily won. What happened to Marko after he left home was unclear. However, it was known that Cain became a mercenary and was eventually imprisoned in a Third World jail when the revolutionary forces he was fighting for were defeated. In the jail, Cain became friends with a fellow mercenary, Black Tom Cassidy.

Prisoner of the Crimson Cosmos
While attempting to find a pathway back to Earth, Cain made his way to the Dream Dimension and aided Dr. Strange in battling Nightmare to rescue Eternity. After successfully rescuing Eternity, Cain attempted to destroy him and was banished back to the Crimson Cosmos. Due to a number of mystic coincidences, it being Halloween, and his desire for revenge, Cain was briefly returned to Earth, in Rutland, Vermont. The powers that be in the Crimson Cosmos, to teach him an abject lesson, made Cain believe that he was aging rapidly until death. Due to the circumstances of his arrival, Cain was pulled between the Earth dimension and the Crimson Cosmos, while causing chaos in Vermont to regain his youth through hate. Coming to the aid of the citizens of Rutland, the former X-Man Beast, battled Juggernaut, who was winning until he realized that Beast's new beastly appearance was real and not a costume. Due to Cain's hate turning to fear, he began to age again and, before he could perish, another portal appeared, returned Cain to imprisonment, and restored him to life when he was brought back to the realm