"Lord Beerus, have you forgotten the Universe Peacekeeper, Kakarot? He had already reached Super Saiyan 6 back then, and he was stronger than you. At least twenty years have passed since then, haven't they? Who knows how far his training has taken him now?" Vegeta said.
Beerus smacked his lips and said uncertainly, "Surely he couldn't have gotten that ridiculously strong?"
"If it were anyone else, Lord Beerus, I certainly wouldn't believe it," Whis said. "But with that Goku, you really never know. Back then, he struck me as an exceptionally gifted fighter. If he's kept training hard all these years, he must be tremendously powerful by now. He might very well rival my father."
Beerus sucked in a breath. "That fellow really is terrifying."
Then he looked at Son Goku. "Look at that. You're both Son Goku, so why is he so powerful? Now look at yourself. All you ever do is find people to spar with. To put it nicely, you're a martial arts fanatic. To put it bluntly, you just love fighting."
"But I'm doing that to get stronger too," Son Goku said awkwardly.
"Hmph. Then how much stronger have you gotten over all these years?" Beerus asked.
Son Goku gave an awkward smile.
"Then who's fighting him?" Vegeta asked.
The others began pondering the question.
"The Grand Priest ranks among the five strongest in the Macrocosm," Whis said. "Who else could rival him? Surely the person fighting Goku from that other world couldn't be the Grand Priest or one of the other top five?"
"Then who could it be?" Beerus asked.
"Rather than guessing here, why don't we travel through spacetime and see for ourselves?" Vegeta said.
"Vegeta, their battle can pierce through spacetime and cause these disturbances," Whis said. "The shock waves are far beyond