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

Crawling Dragon #2 + Mega Thunderball → Twin-headed Thunder Dragon

Crawling Dragon #2 + Electric Lizard → Twin-headed Thunder Dragon

Red-eyes B. Dragon + LaLa Li-oon → Twin-headed Thunder Dragon

Red-eyes B. Dragon + Kaminarikozou → Twin-headed Thunder Dragon

Red-eyes B. Dragon + Sanga of the Thunder → Twin-headed Thunder Dragon

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

Red-eyes B. Dragon + Kaminari Attack → Twin-headed Thunder Dragon

Red-eyes B. Dragon + Tripwire Beast → Twin-headed Thunder Dragon

Red-eyes B. Dragon + Bolt Escargot → Twin-headed Thunder Dragon

Red-eyes B. Dragon + Bolt Penguin → Twin-headed Thunder Dragon

Red-eyes B. Dragon + The Immortal of Thunder → Twin-headed Thunder Dragon