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The manga and some supplementary material states that they went for a visit and Trunks wanted to train with Vegeta and Goku. 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 only noteworthy thing she does is give the Potara Earrings to Goku and Vegeta so they can become Vegito. Future Mai barely does anything despite being prominently featured on the Prison Planet Arc poster.
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In the anime, Future Trunks and Cooler barely do anything as the plot is focused more on Goku, Vegeta and their Xeno counterparts fighting Cumber.Lagss is simply forgotten after Golden Cooler defeats her off screen, in the manga, she's actually absorbed by Majin Ozotto.Future Trunks and Cooler have more to do by fighting the other members of the Prison Planet (Specifically Majin Ozotto, King Cold and Hatchyjack) while Goku and Vegeta deal with Cumber.Vegeta takes Xeno's place as the one who talks with Fu. 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.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.The mention of Ultra Instinct, letting the reader be sure the story takes place after the Universe Survival Saga of Super.The manga adaptation expands details about it while not changing overall the story. Adaptational Expansion: The anime is short and goes straight to the point, leaving details aside.a synopsis of the first campaign of the saga can be read here. The Universal War saga skips Oran and Kamin taking over the Saiyans from Planet Sadala, and to Vegeta fighting a mind-controlled Cabba, instead only making Oran and Kamin taking control of Caulifla and Kale.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 Prison Planet saga entirely skips introducing Future Trunks and Mai, and make Fu into more of a villainous 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.The manga adaptation, by comparison, does a more faithful adaptation to the games campaign. 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. Adaptation Distillation: To an offensive degree.Among them, many of the enemies in the Prison Planet, the inclusion of Kefla, and the appearance of other characters. Adapted Out: Many ideas from the arcade campaigns were dropped from the anime adaptation, but they remain in the manga.Likewise, while SS 4 Goku and SSB Goku seemed to be about at equal strength, later episodes treat SS 4 (and by extension, Xeno Goku, Vegeta, and Vegito) to actually be stronger, as they have more success with handling their opponents. Adaptational Badass: Xeno Goku and Xeno Vegeta are much more serious and to the point than their Super counterparts, Xeno Goku in particular seems to be much less interested in trying to find strong opponents as he does in doing his job.