First, Cell stores up an immense amount of energy as he prepares a Super Kamehameha. He then brings his hands forward and fires a blast that Cell claims has enough power to wipe out the entirety of Earth's Solar System.
Cell uses this attack at the end of the Cell Games, against Super Saiyan 2 Gohan. Though Gohan counterattacks with the Father-Son Kamehameha, Cell overpowers Gohan several times during the Beam Struggle. However, as Cell is about to finish off Gohan, Vegeta distracts Cell with a huge ki blast. With Cell distracted, Gohan uses the brief window of opportunity to unleash all of his power, overpowering and completely annihilating the evil Bio-Android.
- Z-Assist Perfect Kamehameha - A variation of the Perfect Kamehameha used by the Future Warrior in Dragon Ball Xenoverse when performing the technique while Cell is their current Master. The Z-Assist causes Cell's soul (which appears as an astral projection of Cell performing the technique) to go into the Future Warrior's body while they're performing it increasing the power of the Warrior's Perfect Kamehameha.
Appearances in games
The attack appears in cutscenes in Dragon Ball Z: Budokai and Dragon Ball Z: Budokai Tenkaichi 2. It was named "Solar Kamehameha" in Dragon Ball Z: Budokai Tenkaichi 3, where it is Super Perfect Cell's Ultimate Blast; it is capable of inflicting major damage to the stage of play. With a few exceptions to which map is being played, whenever it hits, it completely changes the stage to Ruined Earth or Dying Namek. The attack also appears in Super Dragon Ball Z, Dragon Ball Z: Tenkaichi Tag Team, the Raging Blast games, Dragon Ball Z: Ultimate Tenkaichi, and Dragon Ball Z: Battle of Z.
In Dragon Ball Xenoverse, it is named Perfect Kamehameha and is Cell's Ultimate Skill. It can be learned by the Future Warrior by taking Cell on as a Master and completing Cell's training. If the Future Warrior technique is performed in battle while Cell is still their Master, then the attack will receive a Z-Assist boost.
"Fires a Kamehameha that has been powered up to the absolute limit at the target locked onto."
— Dragon Ball Xenoverse 2 Tutorial description
In Dragon Ball Xenoverse 2, the Perfect Kamehameha returns as Perfect Cell's Ultimate Skill, which can be learned by the Future Warrior (Xenoverse 2) by completing School Quest: "Lesson 3" of Cell's Training. Unlike its appearance in Xenoverse, the Future Warrior will actually shout the name of the attack when performing it. When used by a Future Warrior with Male Voice Option 8, the Future Warrior will humorously call out Ka-Moo-Ha-Moo-Hyaa! when performing the technique. Also if the Future Warrior is a Saiyan, Cell will mention that his Perfect Kamehameha is different from Goku's Kamehameha and Vegeta's Galick Gun, and if they learn to use it correctly they could easily wipe out two or three entire planets.
- Ironically, the Z-Assist Perfect Kamehameha from Xenoverse resembles the Father-Son Kamehameha.