Gigazombie (ギガゾンビ Gigazonbi) is the main antagonist from the 1989 film, Doraemon: Nobita and the Birth of Japan and its remake, Doraemon: Nobita and the Birth of Japan 2016. He is a time criminal that originated from the 23rd century.
Gigazombie is the malevolent leader of the Kurayami Tribe that was feared by the Hikari Tribe for his "mystical" powers, supposedly being able to summon lightning and wind at will. In truth, he is actually a time criminal that originated from the 23rd century that came back in the prehistoric era with an agenda; to change the world's history to create his own world and become king. Perceiving prehistoric humans the easiest to manipulate, Gigazombie integrated his 23rd century technology into prehistoric objects to disguise them as his mystical powers and chose the Kurayami Tribe as his servants and used them to capture the Hikari Tribe to turn them into his slaves.