Dragon Ball Z Episode 30

Five years after winning the tournament, Goku is living a happy life with his family, but Raditz arrives and ruins the whole scene. He claims to be Goku’s brother and reveals that Goku is actually a dangerous Saiyan, sent to clear the land as a child. But after receiving a blow to the head, Goku forgets all his modesty and becomes the protector of the world. When Raditz’s plan doesn’t go well and Goku refuses to go with him, he threatens that a catastrophe is about to strike the earth that will shake everything. Now the whole battle is about to begin for the seven magical Dragon Balls that can fulfill any wish, and only the one with the tail will survive this battle.