Citadel on the Edge of Vengeance
1st appearance "Triple-Iron"
After learning that Harold Meachum has put a bounty on Iron Fist's head, Daniel decides to take the fight to Meachum. However, this proves to be a challenge as Meachum (having had 10 years to prepare for Iron Fist's arrival) had rigged his office building with a number of traps, all of which Iron Fist manages to fight through. The last trap however is deactivated by a mysterious Ninja who briefly helps Iron Fist.
Breaking through a door into the final room of the Meachum building, Iron Fist comes face to face with a man named Triple-Iron, who has been trapped in that room for 10 years and has vowed to kill Iron Fist.