Thousand Dragon + Electric Snake → Twin-headed Thunder Dragon

Thousand Dragon + Mega Thunderball → Twin-headed Thunder Dragon

Thousand Dragon + Electric Lizard → Twin-headed Thunder Dragon

Kairyu-shin + LaLa Li-oon → Twin-headed Thunder Dragon

Kairyu-shin + Kaminarikozou → Twin-headed Thunder Dragon

Kairyu-shin + Sanga of the Thunder → Twin-headed Thunder Dragon

Kairyu-shin + Thunder Dragon → Twin-headed Thunder Dragon

Kairyu-shin + Kaminari Attack → Twin-headed Thunder Dragon

Kairyu-shin + Tripwire Beast → Twin-headed Thunder Dragon

Kairyu-shin + Bolt Escargot → Twin-headed Thunder Dragon

Kairyu-shin + Bolt Penguin → Twin-headed Thunder Dragon

Kairyu-shin + The Immortal of Thunder → Twin-headed Thunder Dragon