Super Dragon Ball Heroes: Universe Mission, unnoficially known as Dragon Ball Heroes: Prison Planet is an animated adaptation of the Prison Planet saga of the video game Dragon Ball Heroes, created as promotional material for the game. It was only released in Japan. It is set some time after the Universe Survival Saga of Dragon Ball Super.
Trunks has been missing, but a mysterious youth named Fu calling himself his friend appears before Goku, Vegeta and Mai, telling them Trunks has been captured in the Prison Planet, a set of planets where only the worst of the worst go. After going there, the heroes find something interesting: Goku from the Time Patrol, who wants to stop Fu, the creator of the Prison Planet.
In another place, Trunks has to deal with Cooler, who wants the Dragon Balls every prisoner has.
Every episode is six minutes long, unlike a typical anime episode. Like with other sagas from Heroes, there is a manga adaptation.
Prison Planet provides examples of:
- Aborted Arc: In the anime, the plot of obtaining the seven Dragon Balls to escape the Prison Planet is actually dropped in a egregious manner.
- Adapted Out: Many ideas from the arcade campaigns were dropped from the anime adaptation, but they remain in the manga.
- Adaptation Distillation: To an offensive degree. The anime of Heroes is made for promotional purposes, yet it doesn't adapt many of the arcade game stories, giving an incomplete and messy story. The manga adaptation, by comparison, does a more faithful adaptation to the games campaign.
- The Prison Planet saga entirely skips introducing Future Trunks and Mai, and make Fu into more of a villanous character, and putting Goku and Vegeta on the Prison Planet to fight Xeno Goku, and to look for the villains who have the Dragon Balls to escape. Yet only Cumber is adapted, making Future Trunks and Cooler presence quite redundant as they do nothing, and by the end the plot thread of looking for the Dragon Balls is dropped, with Xeno Goku teleporting everyone out of danger while Goku remains on the destroyed planets
- The Universal War saga skips Oran and Kamin taking over the Saiyans from Planet Sadala, and to Vegeta fighting a mind-controlled Cabba, instead making Oran and Kamin taking control of Caulifla and Kale. a synopsis of the first campaing of the saga can be read here.
- Adaptational Expansion: The anime is short and goes straight to the point, leaving details aside. The manga adaptation expands details about it while not changing overall the story.
- The mention of Ultra Instinct, letting the reader be sure the story takes place after the Universe Survival Saga of Super.
- More exposition about the Prison Planet and Whis' commentaries indicate how aware he is of the different timelines and how he's never heard of such a place.
- Fu and Xeno Goku's personalities are changed, with Xeno Goku being more eager and surprised to fight against his Super incarnation, and Fu is less obvious about being the Big Bad. Vegeta takes Xeno's place as the one who talks with Fu.
- Future Trunks and Cooler have more to do by fighting the other members of the Prison Planet (Expecifically Majin Ozotto, King Cold and Hatchyjack) while Goku and Vegeta deal with Cumber.
- Advertised Extra: In the anime, Trunks and Cooler barely do anything as the plot is focused more on Goku, Vegeta and their Xeno counterparts fighting Cumber. In the manga they have more relevance.
- All There in the Manual: The anime doesn't explain why Future Trunks and Future Mai are back in the present and on Beerus' planet of all places. The manga and some supplementary material states that they went for a visit and Trunks wanted to train with Vegeta and Goku.
- Back from the Dead: Exaggerated in Zamasu's case. In the original series, Zamasu was erased along with an entire timeline by Zeno, yet somehow he returns with bionic elements.
- Big Bad: Fu. He's the creator of the Prison Planet and the reason why Trunks and the rest are trapped in there fighting with many villains.
- The Cameo: Bojack can be seen on a computer screen in Fu's lair in the first episode, implying that he's on the Prison Planet too.
- Composite Character: Zamasu obtains bionic elements just like Frieza did.
- Continuity Snarl: There are some minor inconsistencies with the main canon. For example, in the anime, Goku teleports to the Prison Planet, where there was nobody around. Goku can't teleport anywhere unless he senses the energy of someone. The manga adaptation simply has Fu teleporting them to Prison Planet himself. On the other hand, he could've locked in on Fu's energy signal instead.
- Enemy Mine: Cooler decides to team up with Trunks and the others so that they can escape the Prison Planet.
- Golden Super Mode: Cooler gained his brother's golden transformation in this mini-series.
- Gotta Catch Them All: Goku and pals have to gather 7 special Dragon Balls by defeating many of the prisoners.
- Let's You and Him Fight: Played with when Xeno Goku attacks regular Goku as soon as he meets the heroes. When the fight is over, he apologizes and explains that he was hoping a clash between them would be powerful enough to break the force field trapping everybody, which didn't work.
- Non-Serial Movie: Or in this case, Non serial mini-series. The anime is not in the same canon as any of the other series, and is just an excuse to see characters like Cooler to return.
- Obviously Evil: The anime doesn't try to hide away the fact that Fu's the Big Bad.
- Skewed Priorities: Goku becomes interested in finding strong opponents on the Prison Planet. Vegeta yells at him and says they should focus on finding Trunks first.
- Teleport Interdiction: Goku is able to teleport himself and his allies to the Prison Planet, but once there, they find that there's a force field around the planet that prevents them from leaving.
- Time Travel Taboo: Fu states he wants to punish Trunks for being a time-traveler.
- We Can Rebuild Him: Zamasu returns in this series with an eyepatch implied to be bionic.