MouGyuuDaiOh is the robot mode of the Ushi Origami (Ox/Bull Origami), the oldest and most powerful of all the Origami in Samurai Sentai Shinkenger. Created over 300 years ago by the people of Mount Tsunobue, its raw power was so overwhelming that no one could control it — so it was sealed deep within the mountain until the modern Ushi Disk finally provided a way to tame the beast. The massive red bull drags a black ox-cart (gissha) behind it and, in Act 33, transforms on its own for the first time into the Samurai Giant MouGyuuDaiOh.

Unlike ShinkenOh, MouGyuuDaiOh is not born from the union of several Origami but from the transformation (henkei) of a single, enormous one — making it one of the most imposing solo mecha in the series. ShinkenOh can ride atop the cart while the bull keeps pulling, delivering a thunderous charging strike (Daishinken: Samurai Slash); for its finisher, MouGyuuDaiOh unloads volley after volley with the Samurai Engine Super Daikai Hou. United with all of the remaining Origami, it forms the colossal grand combination Samurai HaOh.

The DX MouGyuuDaiOh / Ushi Origami (Bandai Japan, 2009, from the Hiden Disk Series) is, at roughly 46 cm, one of the largest Shinkenger toys ever made. Like on the show, it switches between Ushi Origami and MouGyuuDaiOh modes, and it is motorized: switched on, it rolls forward in both modes, and slotting a Hiden Disk onto its helmet makes the disk spin as it drives. Hiden Disk 20 and 21 are included. Combine it with all ten Origami and you build the roughly 49.5 cm-tall Samurai HaOh — a genuine shelf monster.

In the West the mecha was released as the BullZord / Bull Megazord (Bandai America, Power Rangers Super Samurai). In the show it is tamed by the young Cody using the Bull Disk handed to him by Red Ranger Jayden. The Bull Megazord sports shoulder cannons and unleashes its finisher as a burst of symbol power from the disk mounted on its head; as part of the Samurai Gigazord it slots into the grand final combination. The US release was smaller and simpler than the lavish Japanese DX original — which is exactly why, for collectors, the big motorized DX MouGyuuDaiOh remains the centerpiece of any Shinkenger display.