After these painful experiments and an even more painful fallout with his brother, James's life changes forever. Weapon X was composed of only mutants and eventually became the basis for some dangerous experiments that James was forced to endure. It recounts how he discovered his natural skeleton claws, his childhood with his brother Victor (aka Sabretooth), and how Colonel Stryker created the Weapon X strike team. X-Men Origins: Wolverine is the backstory of James Howlett, the man who would be Wolverine.