Aspen Matthews is the main character of Fathom, a comic book series created by Michael Turner.
Aspen Matthews is caught between two worlds. During her early adolescence, she could remember nothing from her early childhood. In her earliest memories she is on the cruise ship Paradise, thought to have been lost for ten years. She was adopted by Captain Matthews, a US Navy captain, and soon developed a passion for water, running to the nearest beach every day to enjoy her favorite recreations of swimming and surfing. She actively pursued this passion and showing tremendous aptitude eventually joined the US Olympic Swimming Team. She trained hard and was chosen to compete in the Olympic Games. However she was eliminated as she tested positive for performance-enhancing drugs despite never having taken any (see Fathom: Prelude #1 for more details). This effectively ended Aspen's professional swimming career, so she chose to study marine biology.
Aspen has recently begun to remember bits of her early childhood, including a memory with her mother talking to a member of the mysterious race known as the Black.
Aspen continued to study marine biology, graduating as a marine biologist. Eventually, she was invited to participate in a deep underwater research station called Deep Marine Discovery (DMD). The primary goal of the DMD was to study a strange alien ship that seemed to have a symbiotic relationship with the surrounding water. Aspen also learns that the DMD was holding a strange alien man named Killian, who had voluntarily surrendered himself. However Aspen did not have much time to study him, as the DMD was suddenly torpedoed by mistake. Killian freed himself, and attempted to abduct Aspen. However, a strange figure intervened and saved Aspen.
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Official Site: Aspen Comics
Links: Wikipedia Blue Heron Comicvine