"Necro" (ネクロ Nekuro) is a series of cards used by Yami Bakura in Yu-Gi-Oh!. While the anime monsters on their own appear to be rather weak (most have 0 ATK and DEF), their strength lies in their ability to spawn tokens or to Summon copies of themselves from the player's Deck. "Cursed Twin Dolls" is a part of this series, since its kana name contains "ネクロ" and was also used by Yami Bakura.