Red-eyes B. Dragon + Electric Snake → Twin-headed Thunder Dragon

Red-eyes B. Dragon + Mega Thunderball → Twin-headed Thunder Dragon

Red-eyes B. Dragon + Electric Lizard → Twin-headed Thunder Dragon

Crawling Dragon + LaLa Li-oon → Twin-headed Thunder Dragon

Crawling Dragon + Kaminarikozou → Twin-headed Thunder Dragon

Crawling Dragon + Sanga of the Thunder → Twin-headed Thunder Dragon

Crawling Dragon + Thunder Dragon → Twin-headed Thunder Dragon

Crawling Dragon + Kaminari Attack → Twin-headed Thunder Dragon

Crawling Dragon + Tripwire Beast → Twin-headed Thunder Dragon

Crawling Dragon + Bolt Escargot → Twin-headed Thunder Dragon

Crawling Dragon + Bolt Penguin → Twin-headed Thunder Dragon

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