WARNING: The following article contains spoilers for Dragon Ball Super, by Akira Toriyama and Toyotarou, available now in English from Viz Media.
In Dragon Ball Super Chapter 48, "Galactic Patrol Prisoner Saga" villain Moro and his subordinate, Cranberry, finally succeeded in summoning the Namekian dragon Porunga. Cranberry used the first of three wishes to heal himself, as he'd been injured badly. The magical Moro then got Cranberry to wish for him to be restored to full power. Now at full strength, Moro killed Cranberry and made a mysterious third wish. Dragon Ball Super Chapter 50 reveals just what Moro wished for, and it has devastating results for the manga's heroes.
The combined might of Goku, Vegeta, Galactic Patrolman Merus and the Grand Supreme Kai/Good Buu prove a match for Moro, though the villain definitely has the edge. However, as Goku and Vegeta -- now at full strength -- prepare to unleash another onslaught, Moro reveals his third wish: He set "every prisoner in the galactic prison" free.
Since he's already insanely powerful and practically immortal due to his ability to drain life from others, Moro doesn't -- like his villainous predecessors -- really need to use the Dragon Balls to make himself god-like, as he already is. Moro instead chooses to summon an army of the baddest criminals in the universe to his cause.
The newly-released prisoners quickly land on New Namek, and Moro shares some of his energy with them. Goku and Vegeta are able to dispatch the villains with relative ease while in their Perfected Super Saiyan Blue forms. They're aided by Grand Supreme Kai, who was injured fighting Moro one-on-one in the previous chapter. However, Moro still possesses the ability to absorb energy. Goku's and Vegeta's power quickly dissipates, and they start regressing. Goku ends up back in Super Saiyan 3 just as former prisoner Saganbo hits him, nearly resulting in the hero going down from one blow. Vegeta lasts a bit longer, but he soon finds himself struggling, too.
Moro reveals his ultimate goal is to eradicate those who strive to preserve peace and "to create an ideal galaxy where I am free to consume planets as I wish." He explains freeing the prisoners is one of the steps in his grand plan to achieve that end.
Realizing that they're outmatched, Goku and the Grand Supreme Kai retreat to Galactic Patrol headquarters with the help of Merus and Jaco. Vegeta doesn't follow suit. Frustrated about the way "fancy parlor tricks" have diminished the might he prides himself on, Vegeta commandeers Galactic Patrolman Irico's spaceship and orders him to fly to Planet Yardrat.
Planet Yardrat played a fairly key role in the early days of Dragon Ball Z. When Frieza destroyed the original Namek, Goku used a Ginyu Force ship to escape, which had the coordinates for Yardrat pre-programmed into it. Goku crash landed on the planet, and the Yardrats nursed him back to health before teaching him Instant Transmission, the technique he uses to traverse space seamlessly. Exactly what Vegeta is hoping to learn from the alien race isn't entirely clear, but their ability to manipulate time and space might end up playing a key role in defeating Moro.
Dragon Ball Super Chapter 51 arrives August 20.