One-Handed Kamehameha

One-Handed Kamehameha is a variation of the Kamehamehathat is performed with one hand.

Overview
The user charges their into their hand (usually while chanting the familiar KA-ME-HA-ME-HA) then fires an energy wave at the opponent. This technique is often performed when one of the user's arms are injured or lost, thus preventing them from performing the original version.

During his climactic battle with King Piccolo, Goku resorted to using a One-Handed Kamehameha to launch himself into the airto finish Piccolo with his Penetrate! technique. In the anime, Goku fired the One-Handed Kamehameha in an attempt to stop Piccolo's attack prior to this event.

Both Gohan and Future Gohan have resorted to using this technique when they lose the use of one of their arms. During the climax of Cell Games, SSJ2 Gohan used the technique when he injured his arm while defending Vegeta from Cell's Time to Die, which later turned into the Father-Son Kamehameha due to Goku's spiritual assistance from Other World. In Future Trunks' timeline, Future Gohan was forced to utilize this technique for the remainder of his life after he lost his arm defending Trunks from the Androids. During his final battle with the Androids, Gohan added the addition of a backflip before firing the technique.

In Dragon Ball Z: Resurrection ‘F’, when Master Roshi is interrupted while charging a Kamehameha against the Frieza Army, he finishes the move by firing it from one hand.

Variations

 * One-Handed Reverse Kamehameha - Used by Goku during his climactic battle with King Piccolo.
 * Angry Kamehameha - A variation of the One-Handed Kamehameha used by Super Saiyan Goku to counter Frieza's Last Emperor during the climax of their battle on Namek.
 * One-Handed Kamehameha mk.II - A stronger version of the One-Handed Kamehameha used by Future Gohan as part of his Fierce Combination.
 * Father-Son Kamehameha - A One-Handed Kamehameha used by Gohan with spiritual assistance of Goku to counter and overpower Cell's Solar Kamehameha, killing the Bio-Android and ending the Cell Games.