Heavy Starbeast GoTaurus

''"Heavy Starbeast GoTaurus!" "GoTaurus!"''

Heavy Starbeast GoTaurus (重星獣ゴウタウラス, Jūseijū GōTaurasu): Black Knight BullBlack's partner who like BullBlack hails form the planet Taurus. Arriving on Earth shortly after the revival of BullBlack, GoTaurus appears whenever BullBlack (and later Hyuuga) call his name. When summoned, GoTaurus is able to infuse his power into Black Knight, enlargening him and transforming him into the giant Heavy Knight (重騎士, Jū Kishi), equipped with the dual Bullsword (ブルソード, Burusōdo) lances which he used to perform the Cross Fire Slash (クロスファイヤー斬り, Kurosu Faiyā Kiri). In this form, Black Knight is able to ride him and the two can perform a powerful charging attack against giant Majin.

Although loyal to BullBlack, GoTaurus was unwilling to go to the same lengths as BullBlack to defeat the Balaban and ultimately abandoned him when BullBlack attempted to trigger an explosion that would have destroyed the entire Earth along with the Balaban. After BullBlack was convinced by the spirit of his brother Krantz to abandon his pursuit of revenge, GoTaurus returned to help but reluctantly stayed behind when BullBlack orderd him not to follow. Later, when Hyuuga was entrusted with the Black Knight powers, GoTaurus accepted him as his new master and the two fought side by side with the Gingaman against the remaining two armies of the Balaban. During the fight against Illies, GoTaurus was seriously injured and couldn't fight in the next few episodes which led to it being captured by Bucrates. While it was briefly let out during the Daitanix battle, GoTaurus was eventually freed at the end of the series after Hyuuga escapes from the Balban members that came to kill Bucrates. It forms a bodysuit for Heavy Knight when forming BullTaurus.

Combined Beast-Warrior BullTaurus
See also: Defender Torozord

"Beast-Warrior Combination! Combined Beast-Warrior, BullTaurus!"

Combined Beast-Warrior BullTaurus (合身獣士ブルタウラス, Gasshin Jūshi BuruTaurasu):  created by the command "Beast Warrior Combination" (騎獣合体, Jūshi Gasshin), GoTaurus take Heavy Knight into himself and transforms into a humanoid shape; rising backwards on on his hind legs while the front legs become the arms and the neck swings up to reveal the head.

In this form both of Heavy Knight's Bullswords are combined into a single Twin Bullsword (ツインブルソード, Tsuin Burusōdo) which Bull Taurus uses for the Bison Fierce Cut (野牛鋭断, Yagyū Eidan) finisher. Later in the series, after Hyuuga receives the Knight Axe, he also gains the ability to use it as BullTaurus.

Triva

 * Unlike the Power Rangers counterpart, GoTaurus is not killed.