St. John Allerdyce is an Australian novelist who has forged a terrorist career as Pyro, the man who controls the living flame. As a member of Mystique's Brotherhood of Evil Mutants, Pyro took part in criminal activities that led him to combat the X-Men on more than one occasion. Unexpectedly, the Brotherhood was granted official governmental sanction as a law-enforcing operation known as the Freedom Force, and Pyro escalated from delinquent to lawman.
The Freedom Force was ultimately eroded, and Pyro returned to his criminal activities. Tragically, he was one of the mutant victims who succumbed to the lethal Legacy Virus. On his deathbed, he ironically assisted Senator Robert Kelly, one of his past targets as a mutant extremist activist.