During the Majin Buu Saga, Supreme Kai used his powers of Magic Materialization to summon a block of Katchin to test the Z Sword. As Goku hurled the cube at Gohan, the Z Sword proved no match for the cube of Katchin, and thus the sacred Z Sword was broken, releasing Old Kai.
Video game appearances
In Dragon Ball Z: Buu's Fury, there is a wall made of Katchin in the Cave of the Ancients on Grand Kai's planet. Unable to break it even with a kamehameha, Goku uses Instant Transmission to pass the wall and get the ancient artifact hidden inside. Later in the game, Supreme Kai makes a block of Katchin appear in order to test the Z Sword like he did in the manga/anime.
In the Budokai series, one of the Supreme Kai's special attacks involves him summoning a block of Katchin and throwing it at his opponent (technique called Supernatural Abilities in Budokai 3). In the Budokai Tenkaichi series, the block is used in the basic rush of the Supreme Kai. In Dragon Ball Z: Budokai Tenkaichi 3, Supreme Kai's downward hypersmash is hitting the opponent with a block of Katchin.
- Length — This screenshot shows the Katchin cube to be about 70% taller than Goku, whose height is 1.75 m, therefore the Katchin cube of Katchin has a length of about 3 meters.
- Volume — Since its length is about 3 meters, the Katchin cube has a volume of about 24 cubic meters.
- Density — The hardest known material in the real universe is neutronium, the matter of a neutron star, which has a density of 1 quintillion (1018) kg/m3. The density of Katchin would thus be greater than 1 quintillion kg/m3.
- Mass — Since the volume is about 24 cubic meters and the density is greater than 1 quintillion kg/m3, the mass of the Katchin cube would be greater than 24 quintillion kg.