Dragon Ball Z - episode 28 - 28 Nov, 1989

Piccolo makes the ultimate sacrifice, and dives in front of Gohan to block Nappa's attack. As Piccolo dies, he tells Gohan that he is his only friend and how sorry he is about being so hard on him during training. With Piccolo dead, Kami and the Dragon Balls are also gone, meaning that no one can be wished back. When all hope seems lost for Earth, Goku finally arrives. After giving Gohan and Krillin a Senzu bean, Goku learns what happened to his friends. Angered, Goku takes out his frustration on the hulking Nappa. (Source: Wikipedia)