Trunks returns from the future to train with Goku and Vegeta. However, it disappears without warning. Then the mysterious Fu bursts in, telling them that Trunks has been imprisoned in the Prison Planet, a mysterious complex in an unknown place in the universes. The group seeks the dragon balls to free Trunks, but an endless battle awaits them! Will Goku and the others rescue Trunks and escape the Prison Planet?
A mysterious figure looks over the new universe's version of West City. Goku was attacked by Frieza and Meta Cooler. In the process, he is contacted by Xeno Trunks, who is at the Time Nest with Xeno Pan, Xeno Gohan, Xeno Goten and Supreme Kai of Time. Xeno Trunks informs Goku that Fu has actually created is merely a copy of the Seventh Universe; any damage inflicted on the buildings in the alternate West City is also transferred over to the real West City. Goku tries to escape, but he is attacked again by Frieza and Cooler. Hearts appears and rescues him. Goku is shocked, but Hearts explains that Demigra pulled his spirit body out of Hell and he wants Goku to help him destroy Fu. Goku and Hearts form an alliance against Frieza and Cooler. Hearts battles Cooler, while Goku taps into Ultra Instinct to subdue Frieza. However, a mysterious masked Saiyan with hair similar to Goku's appears and implants two dark red Dragon Balls into Frieza and Cooler, granting them a significant powerup.
Goku and Hearts struggle against the newly-empowered Frieza and Cooler, until their battle is interrupted by the arrival of the alternate Broly in his Legendary Super Saiyan form. Broly attacks all four combatants, overpowering them all, as the masked Saiyan looks on. Suddenly, a mysterious cloaked figure arrives on the scene and attacks both Cooler and Frieza, removing the Dark Dragon Balls from both of them.
On the unknown planet, Vegeta, Turles and Cumber begin fighting each other. Cumber temporarily disables Vegeta and continues fighting Turles, while Goku and Hearts arrive to help Vegeta. They are confronted by the masked Saiyan, who reveals himself as...
Vegeta intervenes to protect Goku, but his new power runs out before he can deal with Black. Black reveals to Vegeta that he is an alternate version originating from before he was destroyed by Future Zeno