Janemba
Janemba was originally an ogre for King Yemma, working at a machine that could bring back the dead. When the machine malfunctioned, the Ogre turned into Janemba. Meanwhile, the malfunctioning brought all the dead villains back to life on Earth, under Frieza's command. Hercule goes to deal with the zombies, while Goku and Pikkon go to deal with Janemba, who has trapped King Yemma inside his palace. Janemba, Goku, and Pikkon begin their fight in the Underworld. Goku is able to deal with Janemba after some battling, and the monster reverts into Super Janemba. Super Janemba's immense power level allows him to easily deal with Super Saiyan 3 Goku, Pikkon, and Vegeta, who had been given his body temporarily to help fight Janemba. Eventually, Goku and Vegeta fuse, but something goes wrong, and they become a very fat and weak fusion named Veku. King Kai blames the messed up fusion on Vegeta, because he did not stretch his index finger out. Veku propels himself away from Super Janemba for the next 30 minutes by farting. In those 30 minutes, Goten and Trunks fight a revived Hitler. They begin easily dealing with him and the Nazis, eventually beating him as Super Gotenks with a Super Kamikaze Ghost Attack. Just after, Hercule is doing a good job fending off the zombies, while Frieza taunts Gohan and Videl. He orders his men to attack the couple, but Gohan easily gets through them, and destroys Frieza with a Ki Blast and a punch to the gut at the same time. This makes all the remaining zombies retreat. Back in the Underworld, Goku and Vegeta unfuse, and try fusing again. This time, it is successful, and Super Gogeta was born. Super Gogeta made quick work of Super Janemba, and ultimately destroyed him.