Marvel's Iron Fist: 44 Easter Eggs & Reference You Must See
41. Master Lei Kung, The Thunderer
When Danny first meets Colleen, he mentions that he was trained by Lei Kung, a prominent figure from the comics - called Lei Kung The Thunderer for full effect - who is billed as one of the greatest martial arts experts in the known world.
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He appears in visions to Danny throughout the show, but he doesn't look the same, taking on a more traditional monk aesthetic rather than the masked luchador he resembles on the page. He is also clearly not immortal or ageless, as he is in the source, and nor is he the father of Davos (since the two are of completely different races).