Professor X meets the Shadow King Superhero Fan Art

A young Charles Xavier crosses paths with Amahl Farouk in Cairo, Egypt:

“Within the bar Xavier met Amahl Farouk, the crime lord of Cairo, who was himself a mutant with vast telepathic powers. Farouk had sensed the presence of another powerful telepath and had struck him with a psionic bolt as a warning to leave the area of his domain, the so-called Thieves' Quarter of Cairo. Xavier and Farouk sat at different tables in the bar and communicated solely through telepathy. Farouk asked Xavier to join him in his criminal activities. Xavier sensing Farouk's evil and depravity, refused. Contending that mutants like themselves had a responsibility to use their superhuman abilities for the benefit of others, Xavier vowed to bring Farouk to justice for his crimes. Xavier's and Farouk's astral forms then began a battle which ended when the former defeated his foe with a powerful bolt of psychic force. Xavier's astral form rejoined his body, and he left the bar. Farouk was the first evil mutant Xavier had ever met and the experience taught him how dangerous people could be if they used their powers for evil. Hence, Xavier's encounter with Farouk was one of the factors that led to his later founding of the X-Men.” –Marvel Wiki