Long ago, Shepherdon was a monster that peacefully coexists with the Victorians and befriended with one of them, Hiyori. However, when a civil war ensued between the use of Victory Lancer, Shepherdon was influenced by the battle and rampaged until a Victorian used the item and becomes Ultraman Victory to stop it. Eventually Shepherdon returns back to its former self but in the aftermath of battle, several Victorians had banished to the other dimension, among them was Hiyori. While the remained ones had their memories forgotten, Shepherdon still regained it.

In modern times Shepherdon lived in harmony with the Victorians, coming to the surface when Alien Chibull Exceller started to steal the Victorian Stones. As the first stone was being taken by Android One Zero, Shepherdon made his attempt to reclaim it but, was attacked by UPG and was forced to retreat while the stone was taken. It appeared again only this time he was too late to grab another one of the stones. Just then Zero One Monslives into the monster, EX Red King. Both monsters would slash and beat each other with their massive arms and hands.