Bojack Unbound

Bojack Unbound ('The Galaxy Is In Danger! The Super Awesome Guy!' in Japanese) is the 9th Dragon Ball Z Movie.

Spoiler warning: Plot or ending details follow.

Having another Tenkaichi Budoukai funded by Mr. Money for his son's birthday, Mr. Satan invites everyone on Earth to a competition on a remote island. The Z Fighters all go, and Son Goku – who is still dead with King Kai – wishes he could compete. After the elimination rounds, the winners reach the final where Mr. Satan's students are dressed as aliens (or so it seems) and are to serve as foes for the warriors. However, Bojack and his men, who were at one time imprisoned within a star by the Kaios, have changed things in secret. They take over the tournament and fight the Z Warriors. After all seems lost, Goku's words of encouragement give Son Gohan the power he needs to stand up to Bojack and his men.