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Janemba is the main antagonist in the movie, Dragon Ball Z: Fusion Reborn. Janemba is created by the overloaded Soul Cleansing Machine in Other World and is a reality-distorting demon and living definition of evil.

Dragon Ball Z (from Dragon Ball Wiki)
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. 

Gogeta is the Metamoran fusion of Goku and Vegeta when they perform the Fusion Dance properly. Wielding the combined and magnified strength of both Goku and Vegeta, Gogeta is an incredibly deadly warrior, and like his Potara counterpart Vegito, he is regarded as one of the most powerful characters in the entire Dragon Ball franchise.