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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 four hundred seventy-ninth chapter of the Dragon Ball manga.
On the Sacred World of the Kais, Goku wants to test the Z Sword and throws a rock at Gohan, who successfully cuts it in half. Supreme Kai then suggests they test it with Katchin and materializes a block of it. Goku throws it at Gohan and it breaks the sword. From inside, comes the Old Kai. He promises that he possess great power.