Gokus first dies when him and Piccolo are trying to kill Raditz. They come to an idea that Goku will grab Raditz tail and Piccolo will shoot a Special Beam Cannnon toward them. Raditz dies but so does Goku.

The next time Goku dies is from Cell. Cell knows Gohan is too powerful and when he gets turned back to his second form he must self destruct. He is about to blow up and destroy earth when Goku comes and does his instant transmission. They end up at King Kai's Planet and everyone on it (Goku, Bubbles, Gregory, King Kai and Cell) die EXCEPT Cell. He regenerates from one single living cell.