Cooler

Cooler is the main villain in the fifth and sixth movies of the anime _Dragon Ball Z_, introduced as the older brother of Freeza, and the oldest son of King Cold. He was designed by Akira Toriyama, the original manga author. Like his brother, Cooler can push his body through transformations to increase his power. Although only two forms are seen, it is stated that Cooler possesses the same number of forms Freeza does, as well as a fifth and more powerful form.

He first travels to Earth in _Cooler's Revenge_ to kill Goku, the Saiyan that defeated his brother Freeza. He ends up fighting Goku in his final form. Once transformed, he increases dramatically in size, speed, and strength; four horns grow to form a crown atop his head as spikes form on his forearms, and he now sports a facemask of sorts, hiding all facial features save his eyes, which are now red and pupiless. ~!In the end, he is sent hurtling into the sun by Super Saiyan Goku.!~

In _The Return of Cooler_, ~!it is revealed that some of his remains merged with the Big Gete Star, allowing him to take control of it and create an indefinite amount of mechanical clones of himself that can constantly repair and improve upon themselves. Capable beyond his organic self, these Metal Coolers are a match for two Super Saiyans and now retain the ability of Instant Transmission. Cooler uses his newfound resources in a bid to absorb New Namek, but Goku and Vegeta destroy both him and the star in the end.!~

He makes cameo appearances in _Fusion Reborn_ and _Dragon Ball GT_, when all villains escape from Hell.

(Source: Wikipedia)