Bolt Penguin + B. Dragon Jungle King → Twin-headed Thunder Dragon

Bolt Penguin + Serpent Night Dragon → Twin-headed Thunder Dragon

Bolt Penguin + Mikazukinoyaiba → Twin-headed Thunder Dragon

Bolt Penguin + Meteor Dragon → Twin-headed Thunder Dragon

The Immortal of Thunder + Skelgon → Twin-headed Thunder Dragon

The Immortal of Thunder + Tyhone #2 → Twin-headed Thunder Dragon

The Immortal of Thunder + B. Dragon Jungle King → Twin-headed Thunder Dragon

The Immortal of Thunder + Serpent Night Dragon → Twin-headed Thunder Dragon

The Immortal of Thunder + Mikazukinoyaiba → Twin-headed Thunder Dragon

The Immortal of Thunder + Meteor Dragon → Twin-headed Thunder Dragon

Electric Snake + Skelgon → Twin-headed Thunder Dragon

Electric Snake + Tyhone #2 → Twin-headed Thunder Dragon