Thunderzords

In the Power Rangers franchise, a Zord is a type of mecha (pronounced "meka", short for "mechanical") that is often piloted by a Power Ranger. Some Zords can combine to form a humanoid robot known as a Megazord. The Zords used by the team at any time will have a theme, such as dinosaurs, mythical creatures, or animals associated with fighting-styles.

In the original pilot of Mighty Morphin Power Rangers, the zords were known as droids.

A zord is defined as:

a giant fighting machine (a.k.a. colossal assault vehicle) featuring the use of humanoid combination, whether through gestalt technology featuring an aggregate humanoid robot, or the internal manning of a non-combining humanoid robot by a humanoid pilot.

When Rita Repulsa invaded Earth, Zordon of Eltar recruited five teenagers to serve as Power Rangers. Upon granting them their powers, Zordon also gave them the Dinozords which are modeled after dinosaurs and other prehistoric animals.

When Lord Zedd arrived to conquer Earth, he unleashed Pirantishead to battle the Power Rangers. Pirantishead froze the Mastodon, Triceratops, Sabertooth Tiger, and Pterodactyl Dinozords, while taking control of the Tyrannosaurus Dinozord and Dragonzord. After reganing control of their zords, it was decided that Zedd was too powerful a threat for the Dinozords to combat. Thus, Zordon and Alpha 5 transformed the Dinozords, with the power of thunder, into the Thunderzords. Later, Zordon and Alpha would create the Tigerzord for the newly created White Ranger.

Following the destruction of the Thunder Megazord and Tigerzord, by the hands of Rito Revolto, Fighting Flea, Lizzinator, Octophantom, and Stag Beetle, the Rangers sought Ninjor and the Temple of Power. The original Power Coins were created by Ninjor and it was believed that if the Rangers could find him, Ninjor could supply them with new powers and zords. Ninjor bestowed upon them six new Ninja Zords. The Ninja Zords lost again when time on Earth was reversed and the Ranger powers were lost.

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Wikipedia