- "You are a living weapon. Drive all of the thoughts out of your mind, except this."
- ―Lei Kung to Danny Rand
However, after Rand abandoned K'un-Lun and returned to New York City, he had to faced the Hand there. During the Da Jue Zhan, Rand fought against warriors of the Hand. In order to defeat them, he imaged Lei Kung so he could help him to understand more about his purpose as the Iron Fist.
- Davos - Son and Trainee
In chronological order:
- Iron Fist
- In the comics, Lei Kung the Thunderer was an immortal martial master and trainer of Danny Rand in K'un-Lun, and the father of the Steel Serpent.
- The medal used by Lei Kung bears the hexagram Li, meaning Fire. It symbolizes tending one's "inner fires" in an appropriate manner and the learning of how best to feed them and how much fuel to use, which is a trait seen in both his son Davos and his trainee Danny Rand.