Dragon Ball Z - episode 94 - 11 Jun, 1991

The battle on King Kai's planet begins with the Z-Fighters against the Ginyu Force and it seems that our heroes' training is paying off. Piccolo does his best for Goku to complete the Spirit Bomb, but it becomes obvious that Frieza will eventually win the battle. At the last moment, the Spirit Bomb is completed, and Goku hurls it at Frieza. Despite Frieza's desperate attempt to repel the attack, he is unable to do so, and the Spirit Bomb explodes on him, seemingly destroying him. (Source: Wikipedia)