1x7 - Yu-Gi-Oh! Capsule Monsters

They group arrives in a volcanic region, where they must get rid of the Sword of Chaos; seeing a sword stuck in the mouth of a volcano, they believe the chaos they must stop is the lava. Tristan gains also Thunder Dragon along the way. Lost, Joey is attacked by Red-Eyes Black Dragon. When Joey grabs Red-Eyes, the dragon becomes a dual armor that turns him evil and makes him attacks his friends; however, Joey is fighting internally for control of his body. He succeeds with the Pharaoh's help, finding that the sword they need to get rid of is not the one in the volcano, but one stuck in Red-Eyes that was making him go berserk. Once the sword is removed, the dragon becomes one of Joey's capsule monsters.