BullZord

The zord form is a massive red ox that drags a black cart behind it. Samurai Megazord can ride atop of the cart with the zord still pulling it, allowing for a charging blade attack.

Megazord Combination
The Bull Megazord is a giant robot that is formed from the zord itself and its cart having undergone the transformation. In this form, Bull Megazord is able to unleash a torrent of firepower from its shoulder cannons. Its final attack uses the symbol power for "ferocious" (猛) it fires its gatling cannon while unleasing a burst of symbol power from the disk loaded on its head.

Gigazord
Gigazord is the combination of all eleven Zords (excluding the Shark Zord). The Bull Megazord's cart opens up for Claw Armor Megazord to stand on while the Samurai BattleCannon attaches to the back of what would be Bull Megazord. Claw Armor Megazord's arms attach to Bull megazord and are replaced with his arms with the Tiger Zord's drills attached. The Bear Folding Zord and Turtle FoldingZord attach to the axles of the gissha, the Octozord's legs attach to the front of Claw Armor Megazord and Bull Megazord's chest is placed on top, revealing the kanji for "All" (全, Zen). The transformation finishes when the Lobster Swords attach to the Ultrazord's helmet and Bull Megazord's cannon attaches above the helmet.

Due to its massive size, the Gigazord cannot move under its own power and instead moves along using the zord cart. Gigazord can attack with its sword. It's also able to attack using Claw Armor Megazord's claws as an additional pair of arms. Its finishing attack, however, is to summon the symbol power of their zords, energizing the cannon atop Bull Megazord's helmet to deliver the final blow.

Trivia

 * The Bull Megazord is named in the toy release that came out January 2012. Zord form goes unnamed on the box.
 * The Gigazord is first seen and named on the back of the package of the Bull megazord
 * The Gigazord's combination with the Shark Zord is Samurai Ultrazord in the toy instructions.
 * This is the second megazord formed from a bull single-handedly, the first being the Defender Torozord.
 * The Bull Megazord toy is a completely original mold. It does not have the electronics of the Japanese mecha version and was designed to be less blocky and more 'humanoid'.