DBZK Episode 22
From Dragon Ball Encyclopedia, the ''Dragon Ball'' wiki
Krillin and Gohan save a young Namekian boy named Dende from Dodoria's attack. The three fly away and manage to hide from the pursuing Dodoria, who is soon after attacked by Vegeta. The two fight briefly. Dodoria begs for his life, offering to tell Vegeta the true story of his home planet's destruction. Vegeta releases Dodoria from his grip, and Dodoria reveals that it was Frieza who destroyed Planet Vegeta out of fear for the Saiyan race's potential. Vegeta is furious at being lied to and being used by Frieza, and kills a fleeing Dodoria.