Dragon Ball Z Episode 28, titled "Goku's Arrival," marks the pivotal return of the hero to Earth to confront Nappa and Vegeta after training with King Kai. Following Piccolo's noble sacrifice, Goku arrives just in time to rescue Gohan and Krillin, with Vegeta soon recognizing his immense new power level.
You can find more detailed episode guides and community discussions on dedicated sites like Kanzenshuu . Dragon Ball Z Episode 28