Super Dragon Ball Heroes

Trunks returns from the future to train alongside Goku and Vegeta, but he vanishes without warning. The enigmatic Fu bursts in, revealing that Trunks has been imprisoned on the Prison Planet, a mysterious fortress hidden somewhere across the universes. The group sets out to gather the Dragon Balls to free Trunks, yet an endless battle awaits them. Will Goku and his allies rescue Trunks and escape the Prison Planet?