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Kurt Ryder was born a metamutant. The details of his parentage and early life are thus far unknown, up until his short stint as a circus acrobat. He was soon kicked out of the circus for looking and smelling too "freakish". In his appearance in JLA: The New Blood #4, the other new blood members, Apollo, Firebird, Mercury, Runaway, and Wraith, headed to New Jersey to investigate reports of a strange creature living in the wild. They discover that the strange creature they were looking for was Kurt Ryder, now calling himself "Jack", and taking the name of Nightcreeper as he joined the New Blood of the Judgment League Avengers. Like the rest of the New Blood members, who were actually brought together secretly by Mister X, Nightcreeper joined the Justice League X-Men as a founding member, generally used as comic relief, until a real story brought up involving him and recent members Angelhawk and Kokoro. Nightcreeper and Angelhawk had both fallen in love with Kokoro, which was causing problems amongst the team. When the Armageddon Agenda arrived, Nightcreeper was among the metamutants who were imprisoned by the JLA. He also was one of the original members of the new JLX team, which was assembled by Wonder Woman when Fin Fang Flame attacked the JLA.[citation needed]


Nightcreeper can teleport, regenerate from severe injuries, and has superhuman strength, speed, agility & stamina.


  • Master Acrobat: Nightcreeper is an Olympic-class acrobat thanks to his flexible spine
  • Master Combatant: He is a skilled hand-to-hand combatant and a master at fencing, which he can even perform with his tail, which is strong enough to support his own weight

Strength level

Normal human male who engages in intensive regular exercise

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