First, Future Trunks draws his hands back and gathers up energy. Then, he thrusts his arms forward and discharges a massive golden-yellow beam of energy towards his opponent.
Future Trunks uses this attack in his Super Saiyan Second Grade form against his father, Vegeta. Determined to save the main timeline from Semi-Perfect Cell, Future Trunks decides to attack Vegeta and prepares his Super Buster Cannon. While Vegeta initially believes that Future Trunks would not attack his own father, he is soon proven wrong as Future Trunks attacks Vegeta with the Super Buster Cannon, blasting the surprised Saiyan prince away up into the air and into the ocean.
Video Game Appearances
This technique is named Pulsar Crash (パルサークラッシュ) in Dragon Ball Z Gaiden: Saiyajin Zetsumetsu Keikaku, and MAX Buster in Dragon Ball Z: Supersonic Warriors 2. It was named Super Buster Cannon in Dragon Ball Z: Burst Limit, where its color is blue, and Dragon Ball Heroes.