If you weren't looking for the Namek Saga, you might be thinking of:
While the threat looms, the fallen Z-Fighters (Yamcha, Tien, Chiaotzu, and Piccolo) continue their spiritual and physical training on King Kai's planet . It is King Kai who first senses the approach of five "incredibly evil" signatures, warning that they are a force of destruction unlike anything the heroes have faced. Gohan Outsmarts a Saiyan Prince
Gohan Outsmarted Vegeta! - Dragon Ball Z Episode 58 Reaction Dragon Ball Z Episode 58
In a display of his ruthless nature, Frieza kills one of his own henchmen, Namole, simply because he is "no longer needed" once the Ginyu Force is en route.
On the surface of Namek, the episode features a high-stakes encounter between and Vegeta . If you weren't looking for the Namek Saga,
On his way back to Krillin and Bulma, Gohan is intercepted by Vegeta. In a tense moment of deception, Gohan hides the Dragon Ball behind a rock and lies to Vegeta, claiming the Dragon Radar in his hand is just a "watch".
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Surprisingly, Vegeta—buoyed by the false belief that he already has all the Dragon Balls—spares Gohan's life, though he does knee the young Saiyan in the stomach before departing.