- This article is about Dragon Ball chapter 479. For Dragon Ball chapter 472 that also goes by this name, see The Zeta Sword.
"The Zeta Sword" (ゼットソードともうひとりの界王神 Zetto Sōdo to Mō Hitori no Kaiōshin, lit. "The Z Sword and Another Kaiōshin") is the two hundred eighty fifth chapter of Dragon Ball Z and the four hundred seventy-ninth overall chapter of the Dragon Ball manga.
Goku readies the boulder, and Gohan thinks he can slice it like tofu. But Shin thinks they should test it with something harder and makes a big cube appear out of thin air. He tosses the cube over to Goku and explains that this is the hardest metal in the universe, Kattin Steel. Goku taps it a bit and is quite impressed. He asks Gohan if he's ready, and then throws the block of Kattin Steel at him. Gohan swings the sword at it, but… the Z Sword breaks when it connects with the block. Everyone is completely shocked, and Goku blames it on Supreme Kai, but Supreme Kai says that the legendary sword was supposed to hold the greatest power. Gohan thinks the legend may have been exaggerated, as he drops the sword’s broken remains.
Gohan does perk up and say his physical strength has gone way up, since the Z Sword was so heavy. Maybe that was the source of the greatest power, and Supreme Kai agrees that Gohan has probably powered up greatly. Goku's unsure if that's enough to beat Majin Buu, though. An old man, in a Supreme Kai outfit, suddenly shows up, scary the heck out of everyone, and says that's not it. Everyone wonders who he is, and the old man says he's a Supreme Kai from fifteen generations ago. A long time ago, a very strong and evil person, not as terrible as Majin Buu, sealed him away in the Z sword. The person was afraid of his "fearsomeness". Goku thinks the old man doesn't look so awesome, and decides to test him by shooting a blast at him. It hits Old Kai right in the face and he hits the ground hard.
Old Kai gets up, and starts calling Goku all kinds of dirty names. Goku figures he's just an old windbag. Old Kai says the bad guy wasn't afraid of his "power", but his fearsome abilities. Goku is curious, but Old Kai says he's not telling, sticking his tongue out. Goku offers him some sexy books if he tells, but Old Kai says he can just watch girls bathe or get undressed with his godly eyes. Goku then offers him a chance to touch the breasts or ass of a real woman, thinking he's the same type as Master Roshi.
Gohan is curious about what he's up to, and so Goku says that when Gohan gets back to the lower world he can ask Videl to do it. Gohan freaks out and objects. Goku relents and asks Old Kai if instead he'd mind an older woman. Goku tells Gohan to tell Bulma the circumstances, and Gohan thinks he can't ask her something like that. Goku asks Old Kai if this ability can beat Majin Buu, and he says it's not definite, but most likely it can. Goku says she could save the universe just by getting felt up a little, and Gohan thinks that's sexual harassment. Besides, and even if they can save the universe, he'll be killed by Bulma. But Goku isn't listening to Gohan and shakes Old Kai's hand.
Now that it's settled, Old Kai explains his super ability. No matter how amazing of a master you may be, he can bring out all of your hidden power far beyond your limits. Goku thinks he's heard of that ability before, but Old Kai insists no one else can do it well beyond the limits like this. He looks at Gohan, seeing that he was the one who pulled the sword out, and says that he can surely make someone who could pull out that sword and swing it around into the strongest in the universe. Though, he'd thought the one who'd free him from the sword would be a Supreme Kai, not an Earthling. Supreme Kai solemnly apologizes.
Old Kai tells Gohan to stand there, and not to move. Then, he starts doing some funky dancing, circling around him. Gohan tries to ask about this, but Old Kai tells him to be quiet for this important ritual. Goku asks how long this will take, and Old Kai says five hours for the ritual, twenty hours for the power up. Goku decides to take a nap, while Kibito and Supreme Kai realize they should probably stay awake. Gohan doesn't like this at all. Meanwhile, Trunks and Goten are still practicing Fusion, and Piccolo says they've nearly perfected it. Now, he wants them to test it, and tells them to match their ki exactly. Trunks is doubtful that the two of them can really fuse. Piccolo shouts that it’s time to begin.
- This chapter is retroactively the first mention of Beerus, as he was later established as being the one who sealed Old Kai away.