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.