Metal Dragon + Electric Snake → Twin-headed Thunder Dragon

Metal Dragon + Mega Thunderball → Twin-headed Thunder Dragon

Metal Dragon + Electric Lizard → Twin-headed Thunder Dragon

Sky Dragon + Thunder Dragon → Twin-headed Thunder Dragon

Sky Dragon + Kaminari Attack → Twin-headed Thunder Dragon

Sky Dragon + Tripwire Beast → Twin-headed Thunder Dragon

Sky Dragon + Bolt Escargot → Twin-headed Thunder Dragon

Sky Dragon + Bolt Penguin → Twin-headed Thunder Dragon

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

Sky Dragon + Electric Snake → Twin-headed Thunder Dragon

Sky Dragon + Mega Thunderball → Twin-headed Thunder Dragon

Sky Dragon + Electric Lizard → Twin-headed Thunder Dragon