What is Dragonball Z Fusion Reborn?

What is Dragonball Z Fusion Reborn?
This is the 12th dbz movie
Plot:
In the other world, Goku and Pikkon were fighting to decide who's the champion. Meanwhile in other part of the Other World, King Jennma had a problem with a purification machine, which turns a little worker into a giant and fat monster called Janemba.Goku and Pikkon went there, Goku was the first to fight the evil Janemba. But Janemba's power makes Goku to transform into a Super Saiyan 3. Even Goku(transformed into a Super Saiyan 3) couldn't defeat Janemba(which transforms into his Final Form). Goku was going to die when Vegeta comes to the rescue. Goku told to Vegeta, that the only form to defeat Janemba is to fuse. Vegeta didn't want to fuse with a "Low Class Saiyan". But Janemba's Power shows him that fusion is the only form. Meanwhile in the Earth, all the enemies reborn to attack Earth(enemies like Frieza,and his soldiers)But Gohan(Great Saiyaman)defeat Frieza with just a punch. Hitler attacked the City but Goten and Trunks were trying to stop him. Meanwhile in the other World, Goku was trying to explain Vegeta the Fusion Dance, Vegeta trought it was silly. When he tried to do the Fusion, Vegeta instead to extend his finger, he extend his hand to form Veku, Veku is fat without any power. Janemba was going to destroy Janemba when the Fusion get over. the escaped to do the Fusion Dance again but Janemba stopped it. Pikkon arrived and he tried to stop Janemba for Goku to make the Fusion Dance. The Fusion Dance works and Gogeta was form. Meandwhile in the Earth Goten and Trunks feel the ki of his fathers and they did the same to form Gotenks. Gogeta with just one attack(Stardust Breaker)destroy Janemba forever.