One of the immortal mutants known as Externals, Crule was the meanest and maddest of them all. According to Gideon, during World War II, he worked in a concentration camp, happily operating a gas chamber. He was an ancient berzerker, being dressed like a barbarian and old enough to remember Mithras. Crule was sent by Gideon to attack X-Force after they rescued Sunspot. However, Crule was blasted out of X-Force's ship by Rictor and fell a few thousand feet, which put him in a body cast. When The Externals kidnapped some of X-Force and were holding them for ransom, X-Force sneaked into Crule's hospital room and abducted him. He was actually happy to help the team "humble" his fellow immortals, and gave them the location of the Externals' hideout and their weaknesses. Crule was killed by Selene in a final battle between the Externals.