Fantomex was created by the Arma Plus Program to serve as a sentinel / super mutant against the population of Earth. Arma Plus created a population of techno-organic organisms whose living tissue was fused with sentinel nanotechnology at the cellular level. His mother, a member of this race, became pregnant when it was fertilized with nanomachines, resulting in the birth of Fantomex. Like the rest of his people, he was born and raised in "El Mundo", an artificial environment designed to create super-sentinels, with favorable media to be hunters of mutants following the model of Saturday's cartoons. the morning. Although his nationality is technically British (since "The World" was in England), Fantomex states that he was raised in France with an imperfect programming. He has developed a French sense of identity and is usually known by the name of "Jean-Phillipe".