Korin wants Krillin, Yamcha, Tien, and Chiaotzu to report for special training! Meanwhile, Gohan’s grueling training causes him to undergo a shocking transformation! But that isn’t easy when he’s tired, hungry - and being chased by bloodthirsty dinosaurs! Alone in the wilderness, he must quickly learn to take care of himself. Gohan begins his first day of Piccolo’s training. Meanwhile, Goku embarks on a new adventure in the next world, as he travels the endless Snake Way to reach the legendary King Kai! Piccolo takes Gohan into the wild for a harsh training program.

When Raditz prepares to strike back, Goku must make the ultimate sacrifice to save his son! Gohan unleashes a mighty attack that not even Radtiz can resist! But as quickly as his power appears, it vanishes. He needs time to gather energy for the blast, which means Goku must fight Raditz alone! Piccolo may have a way to stop Raditz - the Special Beam Cannon! There’s only one problem. Raditz has kidnapped Gohan, and unless Goku agrees to join the sinister Saiyan, he may never see his son again! All hope is not lost, however, as a second visitor arrives, and Goku forges an unlikely alliance! The smiles quickly fade, however, as an unexpected visitor - Raditz - lands on the island. Goku and Gohan attend a reunion on Master Roshi’s island, where Goku introduces his son to all of his old friends. A new threat - a powerful and sinister alien - is on its way to Earth. Goku’s quiet life with his family and friends is about to be interrupted.

Dragon ball z kai season 5 ep 17