Uchiha Madara pulled Goku to a less crowded spot.
Goku looked into Uchiha Madara's eyes and said, "Mr. Uchiha Madara, what exactly did you pull me over here for?"
Uchiha Madara knew that the dark presence had vanished again. He breathed a sigh of relief. If that dark aura had not disappeared, he would not have dared speak directly to Goku. "Mr. Goku, just now... did you sense some kind of aura?"
Goku said in surprise, "What, did you sense it too, Mr. Uchiha Madara?"
Uchiha Madara nodded. "Yes. I sensed a black aura. It was extremely domineering and fierce. I knew that aura would gradually grow and eventually throw your world into chaos, which is why I came here from another world."
Goku looked at Uchiha Madara as though he were looking at an alien. "What a coincidence. I came from another world too..."
Uchiha Madara glanced at Goku, and Goku glanced back at Uchiha Madara. Then they suddenly burst out laughing together.
They exchanged their backgrounds, and Uchiha Madara was astonished to discover that Goku really had come from another world. That world was called the Saiyan world, and Goku had been an utterly ordinary Saiyan born there. The reason he had appeared in the Dragon Ball world was that the Saiyan world had suffered a massive attack. To preserve even a sliver of hope for the Saiyan bloodline, Goku's parents had sent the newborn Goku here in a spaceship.
In a sense, Goku really was just like Uchiha Madara—someone who had come here from another world.
Having shared the same experience, it became much easier for them to talk. Although Goku had married a wife from the Dragon Ball world, he was different from her. When he viewed matters, he possessed a perspective detached from this world.