Frieza's attack on Namek detonates the planet's core, and he claims that Namek will explode in five minutes. Super Saiyan Goku is confident that he can defeat Frieza within that time, however Frieza then decides to power up to 100% of his full power. Much to King Kai's amazement, Goku allows Frieza to reach his full power rather than attacking while Frieza powers up, wishing to defeat the tyrant at his best.