The fourth movie.

The Z Warriors discover an unopenable music box and are told to open it with the dragon balls. The contents turn out to be a warrior named Tapion who had sealed himself inside along with a monster called Hildegarn. Goku must now perfect a new technique to defeat the evil monster. 

(Source: ANN)

On the vivid and glistening waters of the Kanda River, Jetters and their respective Shooters race together on their jet skis, speeding through the wind as they participate in Jet Races—"the world's most intense aquatic sport!" Chasing her dream of becoming a professional Jet Racer like her mother, Rin Namiki transfers to Asakusa Girls' High School in Tokyo. There, she stumbles upon Misa Aoi, a first-year student like her. However, tensions arise when Rin and Misa find themselves competing in a race against Team Dress from the prestigious Musashino Girls' High School. As a result of the race, Rin tries to join her school's Jet Racing club, only to discover that there is none. But, her resolve is unshaken, and she decides to recruit Misa and three other girls to create her very own team: "Kandagawa Jet Girls." With her heart set on winning the annual Kandagawa Cup, Rin, alongside her team, approaches the grandest stage of them all. [Written by MAL Rewrite]

Onto their third serialization, manga duo Moritaka Mashiro and Akito Takagi—also known by their pen name, Muto Ashirogi—are ever closer to their dream of an anime adaption. However, the real challenge is only just beginning: if they are unable to compete with the artist Eiji Niizuma in the rankings within the span of six months, they will be canceled. To top it off, numerous rivals are close behind and declaring war. They don't even have enough time to spare thinking about an anime! In Bakuman. 3rd Season, Muto Ashirogi must find a way to stay atop the colossal mountain known as the Shounen Jack rankings. With new problems and new assistants, the pair continue to strive for their dream. [Written by MAL Rewrite]