Victor was once the leader of the Alchemy Warriors 100 years ago. Originally, Victor used a regular kakugane until he sacrificed himself to kill the leader of the homunculus of that era. In order to save him, his wife Alexandria transferred Black kakugane "I" into his heart. However, the power went berzerk and Victor killed everyone in the lab, as well as critically injuring Alexandria. Victor was then forced to flee his home, pursued by Alchemy Warriors and the Homunculus group lead by his own daughter, Victoria, who was also turned into a Homunculus against her own will. Victor managed to destroy a large portion of both forces before he fled to Japan, where he met Chōno Bakushaku, before he became Dr. Butterfly. The two men then struck a bargain; if Victor gave Dr. Butterfly his knowledge of Alchemy, Dr. Butterfly would heal Victor in return. After 100 years, the plan succeeded; Victor was healed and re-appeared in LXE's Ginsei High school attack. He managed to kill Kazuki once more, by crushing the Sunlight Heart with his Buso Renkin, Fatal Attraction, this damaged Kazuki's kakugane, and by doing so, Victor caused black kakugane "III" to awaken, he and Kazuki soon went into a battle, but both warriors soon ran out of energy and Victor was forced to retreat. Afterwards, he traveled around the world, abosrbing large amounts of energy from locations such as New York, Paris, and even the Arctics. Eventually, he was forced into the Pacific ocean, where he evolved from stage 2 to stage 3, and battled Sakaguchi Showusei's Buso Renkin, the Buster Baron, however, he used the corpses of ocean creatures, whose energy he had absorbed, and single-handedly destroyed Buster Baron with his own Buso Renkin, the war-axe, Fatal Attraction. He confronted Kazuki then, with Kazuki forcing White kakugane "II" into his body. However, White kakugane "II" was only able to revert him back from stage 3 to stage 2. As a last resort, Kazuki used the Sunlight Heart + and sent both of them to the Moon.

(Source: Wikipedia)