K'un-Lun's most valued and feared warrior, Lei Kung has spent milennia training young men to defeat the dragon Shou Loa and achieve the powers of Iron Fist. Despite this very few actually managed to achieve the power and even his own son Davos failed in his attempt and became the super-villain known as Steel Serpent. Eventually Daniel Rand-Kai, son of Wendell the man who defeated Davos in year past, managed to defeat the Dragon and obtain the power. However, Master Khan was angered over the death of his dragon and stated that Daniel's life was forfit unti Lei Kung intervened and saved his life. Lei Kung was also amongst the people that helped save Iron Fist when he was captured by the H'ylthri and when Davos eventually took the power of the Iron Fist and returned to K'un-Lun it was The Thunderer who brought Danny into the city to defeat his son and hopefully redeem him. He was seen most recently tellingn Iron Fist and the Steel Serpent that their place was at the city of K'un-Lun to prepare for a tournament amongst immortals.