Thunder Dragon + Darkworld Thorns → B. Dragon Jungle King

Thunder Dragon + B. Dragon Jungle King → Twin-headed Thunder Dragon

Thunder Dragon + Witch of the Black Forest → Kaminari Attack

Thunder Dragon + Leo Wizard → Kaminari Attack

Thunder Dragon + Abyss Flower → B. Dragon Jungle King

Thunder Dragon + Patrol Robo → Metal Dragon

Thunder Dragon + Weather Report → Kairyu-shin

Thunder Dragon + Mechanical Snail → Metal Dragon

Thunder Dragon + Greenkappa → Sword Arm of Dragon

Thunder Dragon + Living Vase → B. Dragon Jungle King

Thunder Dragon + Tentacle Plant → B. Dragon Jungle King

Thunder Dragon + Morphing Jar → Stone D.