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Dragon Ball Z 
Dragon Ball Z follows the adventures of the adult Goku who, along with his companions, defends the earth against an assortment of villains ranging from intergalactic space fighters and conquerors, unnaturally powerful androids and near indestructible magical creatures.

While the original Dragon Ball anime followed Goku through childhood into adulthood, Dragon Ball Z is a continuation of his adulthood life, but at the same time parallels the maturation of his son, Gohan, as well as other characters from Dragon Ball and more. The separation between the series is also significant as the latter series takes on a more dramatic and serious tone. The anime also features characters, situations and back-stories not present in the original manga. (from Dragon Ball Wiki)

Cell (セル Seru) is the ultimate creation of Dr. Gero, designed via cell recombination using the genetics of the greatest fighters that the Remote Tracking Device could find on Earth. The result was a "perfect warrior", possessing numerous favorable genetic traits and special abilities from Goku, Vegeta, Piccolo, Frieza and King Cold.

He was one of the few Red Ribbon Androids not directly completed by Dr. Gero, instead being completed by Dr. Gero's Supercomputer in an alternate timeline. After achieving perfection, he sought to dominate the world through fear of his incredible power. He is the main antagonist of the overarching Cell Saga. (from Dragon Ball Wiki)