1x9 - Yu-Gi-Oh! Capsule Monsters

The masked man reveals himself as Alexander the Great; he also explains their final test is to slay the Fiendish Five, dragons terrorizing a village. The village IS protected, by a mighty dragon of light, but its power grows weak at night. Alexander gives Grandpa a Curse of Dragon, while Yugi gains Black Luster Soldier. The Fiendish Five, consisting of Tyrant Dragon, Meteor Dragon, Serpent Night Dragon, Water Dragon and Luster Dragon #2, is seemingly defeated; however, they return and force the group back to the village. The Pharaoh realizes that the fabled blade able to slay them can only be removed when they approach the village; he uses it to cut them down. However, the Fiendish Five combine into Five-Headed Dragon, which can only be slain by Light monsters.