Goku, Vegeta, Xeno Goku, Xeno Vegeta, Xeno Trunks, Xeno Pan, Majin Salsa and Putine arrive on the Universe Tree, which is still absorbing energy from the multiverse. Vegeta attempts to destroy the Tree with a large ki blast, but it absorbs the energy instead. Fu then appears and confronts the group, informing them that he plans to create a new universe using the Tree. Xeno Goku, Xeno Vegeta, Xeno Trunks and Xeno Pan are suddenly teleported away by Fu's female companion, who is revealed to be Towa; she tells Fu that she is doing something for him, and then teleports away along with Majin Salsa and Putine. Vegeta powers up to Super Saiyan Blue and attacks Fu, but Fu reveals that he now has access to Cumber's energy and channels Cumber's aura through his own body, using its effects to corrupt Vegeta's ki and drive him berserk. Goku tries to intervene, but Fu corrupts his ki as well.

Towa restrained Xeno Goku, Xeno Vegeta, Xeno Trunks, and Xeno Pan in her artificial space using Cumber's dark ki, and proceeds to reveal Fu's nature as her creation using data from previous Dragon Ball fighters and villains. She explains that her plan is to make Fu as the new Demon King using Mechikabura's ki she stored in a dark energy orb upon his death. Xeno Goku manages to break free and attacks Towa, only to be blocked by Mira. Towa teleports Xeno Gohan and Xeno Goten into the space, both unconscious as their ki has been drained before, then teleports Mira and herself out as the space breaks, pulling all inside into something like a black hole. Meanwhile, Vegito in Super Saiyan Blue is fighting Fu in the front of Universe Tree and seemingly getting the upper hand.

Fu is horrified by the Universe Tree's death, until Towa and Mira arrive to help him. Towa infuses Mechikabura's energy into Fu, dramatically increasing his power and causing him to undergo a transformation into the new Demon King. However, Fu expresses no interest in this, and begins using his new powers to restore the Tree instead. Vegito tries to stop him and their fight resumes, but Towa and Mira intervene to help Fu and buy time for him by attacking Vegito. Before Fu can finish restoring the Tree, however, a portal opens and Xeno Vegito emerges, now powered up to Full-Power Super Saiyan 4 and accompanied by the Demon God Demigra. Xeno Vegito attacks Fu, and the battle resumes. Meanwhile, in an unknown location, an alternate version of Broly awakens.

Xeno Vegito begins fighting Fu; the two of them seem to be evenly matched, until Fu uses his dark magic to change the area around them. He manifests a large combat arena for them to fight in, and prepares to engage both Vegitos in battle until the three of them are interrupted by the sudden arrival of the alternate Broly in his Legendary Super Saiyan form. Xeno Vegito overpowers Broly, until Broly also transforms into a Full-Power SS 4. The main timeline's Vegito joins the fight and the two Vegitos battle Broly together, but even the two of them together struggle against his monstrous power. Meanwhile, Fu uses his magic to fully revive the Universe Tree. The main-timeline Vegito continues fighting Broly, while Xeno Vegito goes after Fu, but the Tree suddenly releases a massive wave of light that engulfs Fu, Broly, and the main-timeline Vegito. Xeno Vegito escapes, while Majin Salsa, Putine, Dr. W, Turles, the captive Cumber and Hearts's spirit body are all enveloped by the energy wave.

Xeno Vegito outruns the energy wave before it dissipates, leaving the area around the Tree unscathed; he returns to find Fu holding the miniaturized form of the new universe created by the Tree. However, Fu is disappointed by his creation, as the new universe is flawed because Fu had to use his own demonic power to refuel the Tree rather than the pure energy of a normal universe. A furious Xeno Vegito attacks Fu, determined to stop him from doing anything else, and their battle resumes. Towa challenges Demigra, but his female companion takes her on instead, while Demigra uses a mystical technique known as "Time Labyrinth" to freeze both Xeno Vegito and Fu in time. Towa claims that Fu will be able to escape the frozen-time bubble, but Demigra is confident that he will not. On Beerus's planet in the Seventh Universe, Whis and Vados sense the creation of the flawed new universe. Meanwhile, in the new universe, Goku awakens alone, in a strange, empty version of West City.