Dragon Ball Z - episode 49 - 22 May, 1990

By using Tien's Solar Flare technique, Krillin, Gohan, and the Namekian boy, Dende, are able to escape from Dodoria. As the pink alien tries to get back to Frieza, Vegeta shows up, ready to settle the score between him and Dodoria. Dodoria is taken by surprise by Vegeta's new strength, and the Saiyan Prince easily overpowers him. Pleading for his life, Dodoria barters information for his freedom. He tells Vegeta that it was actually Frieza, not an asteroid, that destroyed Planet Vegeta. Although taken aback at this new revelation, he kills Dodoria anyway. (Source: Wikipedia)