Danny Rand trained in martial arts for many years, eventually learning a rare discipline which allowed him to focus his life energy, or chi, in his hand, rendering it hard as iron. At some point he befriended Shang-Chi, possibly in the school of Master Kee. Inspired by the example of individuals like Spider-Man, Danny considered dedicating himself to crimefighting, or community service as he called it; thus, when he saw a street altercation involving a large man grabbing a smaller man by the head and threatening violence, he intervened. When the larger man refused to let his victim go, Danny knocked him down with a kick to the head; when his opponent rose to attack, Danny began to focus his "iron fist", only to be sent flying by and unexpected blow from Spider-Man, who happened by and assumed Danny was the villain of the piece. This poort start did not deter Danny's community spirit, but a later incident where he used his "iron fist" on a man saw him sentenced to six months in Ryker's Island. Released on parole after four, he sought out his old friend Shang-Chi; however, when Shang-Chi was attacked by the arrival of the Dragons, a local gang; the ambitious crimelord Hammerhead; and his Enforcers, Danny was drawn into the gang war between Hammerhead and the Kingpin, and encountered Spider-Man again, this time as an ally.
Later, he reappeared along with Shang-Chi, Moon Knight, Spider-Man, and Daredevil as a member of Daredevil's team to take down the Kingpin. Daniel ended up betraying the team to Kingpin. Daredevil found out the deception and demanded answers from Daniel. He found out that Kingpin had Daniel's daughter, and Daniel chose his daughter's life over the team. He did distract Kingpin long enough for Daredevil to reach his wife. Daniel was last seen walking with his daughter.
Rand can focus his spiritual energy into an impervious fist of iron. Daniel can concentrate his Chi to enhance his strength,speed, stamina, agility, reflexes, and durability. He can also heal himself and others.