Thousand Dragon + Kaminari Attack → Twin-headed Thunder Dragon

Thousand Dragon + Tripwire Beast → Twin-headed Thunder Dragon

Thousand Dragon + Bolt Escargot → Twin-headed Thunder Dragon

Thousand Dragon + Bolt Penguin → Twin-headed Thunder Dragon

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

Thousand Dragon + Electric Snake → Twin-headed Thunder Dragon

Thousand Dragon + Mega Thunderball → Twin-headed Thunder Dragon

Thousand Dragon + Electric Lizard → Twin-headed Thunder Dragon

Fiend Kraken + Crawling Dragon #2 → Kairyu-shin

Fiend Kraken + Crawling Dragon → Kairyu-shin

Fiend Kraken + Dragon Zombie → Kairyu-shin

Fiend Kraken + Wings of Wicked Flame → Fire Kraken