Galactic Demon Sword Saberugin

Galactic Demon Sword Saberugin (銀河魔神剣サーベルギン) (40): A powerful cursed sword that can possesses its wielders, using them as he sees fit. It arrived on Earth, finding a host in Billion. He then later uses a boy to attack the Fiveman, defeating them easily. Billion then lets the boy/Sabergin after the populace, attacking everyone in sight. The Fivemen were forced to fight the boy to save him. But Gaku managed to talk the boy in fighting Sabergin's will and free himself from Sabergin. Enraged, Sabergin returns to Billion, providing his power in evolving Billion. However, the upgrade faded away after the sword was destroyed by the Five Robo.