Lei Kung is an elder monk of the Order of the Crane Mother, the father of Davos. When Danny Rand joined the Order of the Crane Mother after his plane crashed in the Himalayas, Lei Kung trained him to become a well trained warrior. Danny was chosen by the Order of the Crane Mother to become the new Iron Fist. In his last trial, Rand defeated Shou-Lao and was granted the power of the Iron Fist. Eventually Rand abandoned the gate and left K'un-Lun, to return home. Not much later K'un-Lun was attacked by the Hand and it disappeared. As such, It is unknown if Lei Kung survived the attack or not.
Training 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.
Attack on K'un-Lun
After Danny Rand and Colleen Wing deciced to return to K'un-Lin, they travelled to China and climbed the icy mountainsides of the Himalayas. Finding better footing, the duo traveled through the pass and discovered that there was blood mixed into the snow. Rand, further onward, learned that there were Hand soldiers dead on the ground; when he reached the gate, he noticed that K'un-Lun had disappeared. As such, It is unknown if Lei Kung survived the attack or not.
- Martial Artist: As an elder monk of the Order of the Crane Mother, Lei Kung has a vast knowledge of martial art, and trained Davos and the Iron Fist to the same level.
- Meditation: Lei Kung is a master of meditation, he regularly meditate to maintain his health and vitality.
- Davos - Son and Trainee
In chronological order:
- Iron Fist
- The Defenders
- 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.