Dragonball Kai episode 48

Description : The Angry Super Saiyan! Throw Your Hat in the Ring Son Goku! The transformed Goku renews his battle with Frieza and proves to now be far superior to Frieza's power. Frieza launches several counter-attacks at Goku, but they have no effect at all. As the tyrant stares in awe at his more-powerful opponent, he realizes that his worst nightmare has finally come true - the legendary Super Saiyan has been born. In a desperate attempt to defeat Goku, Frieza hurls an attack down upon Namek itself, in an effort to destroy the planet and everyone on it.