On Beerus’ planet, Goku and Vegeta are sparring with Whis while Beerus himself naps nearby. Mai interrupts their training, telling Goku and Vegeta to come with her: it seems that Trunks has disappeared! Shin notes how Future Trunks had come to this planet for training. A purple man suddenly appears, saying he will tell them what has happened. He calls himself “Fu” and claims to be a friend of Trunks, who has gotten mixed up in something terrible, and is now on the Prison Planet.
Vegeta wonders how Fu knows this, but Fu explains that it’s only natural for him to investigate the situation since his friend’s in trouble. Fu explains how many dangerous criminals from throughout the universe are gathered on the Prison Planet; they’d better hurry or Trunks will be in trouble! With that, Fu disappears. Vegeta and Goku resolve to head off, while Whis is concerned about this “Fu” person. Shin meanwhile asks Mai to do him a favor.
Goku teleports himself, Vegeta, and Mai to the Prison Planet. Goku is amazed at the planet’s huge chains, while Vegeta immediately senses someone’s ki. It turns out to be another version of Goku, dressed in odd red clothes. This new Goku (“Goku Xeno” from here on out) says “I found you” and immediately transforms into Super Saiyan 4. Regular Goku transforms into Super Saiyan Blue, while Fu observes things from a distance. As the two Gokus battle, Goku Xeno figures that regular Goku must be his counterpart from “over there”, and wonders if he’s an ally of “him”.
As the fight continues, Goku flies up and hits his head on an invisible barrier. Goku Xeno explains that this is a fully sealed-off space, so escape is impossible. The two Gokus fire Kamehamehas at each other, which cancel out. Goku Xeno says it was no use, though regular Goku doesn’t know what he means.
Fu laughs: just as you’d expect of the Saiyans, two Gokus make for extremely interesting specimens. Goku Xeno angrily fires a blast at Fu, but he easily deflects it. Fu knows that Goku Xeno was trying to use the Kamehameha clash to break through the sealed space, but assures him this is impossible. Still, it’s incredible for Goku Xeno to have thought up a plan like that on the spot; just what you’d expect of the Time Patrol!
It turns out that Goku Xeno is a member of the Time Patrol; he’s a version of Goku from another dimension, who works as a trans-dimensional cop. Vegeta points out that Fu sure knows a lot about the Prison Planet, and Fu happily explains that he created it as a laboratory. He gathers strong warriors from different universes here and has them fight…forever! However, Fu figures that Goku Xeno got captured on purpose, as part of his investigation.
Mai is angry that Fu lied to them, and wonders if Trunks is even here, but Fu assures her that Trunks is a precious specimen. After all, he’s a mortal capable of travelling through time…though now he’ll pay the penalty for it. Vegeta demands to know where Trunks is, but Fu says they’ll have to find him themselves. The group needs to gather a set of special Dragon Balls to escape the planet. Goku Xeno already has one which Fu gave him, but the rest are all in the hands of strong people.
Fu declares a start to his experiment and takes off. Elsewhere on the planet, Trunks awakens in a cell, and the doors mysteriously open. Venturing out, Trunks soon encounters Cooler, who demands Trunks hand over the Dragon Ball, though Trunks doesn’t seem to know what he’s talking about.
Fu monitors the situation on the planet from some sort of control room. All the players are assembled, and the most interesting experiment in the universe can enter its main phase. Behind Fu, a mysterious chained figure crackles with energy. Fu assures him that his turn will come a bit later, and calls him “the evil Saiyan".
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