Earth will still die. The fungus will take the oxygen from your atmosphere. [The Doctor: No, I'm afraid you've failed there too. We can destroy the fungus.] Kill him!
Who: Slaar (Alan Bennion)
Source: Doctor Who: The Seeds of Death episode 6
Note: After the Grand Marshall's fleet is sent spiraling into the sun, Slaar orders his remaining Ice Warrior to kill the Doctor, but Jamie distracts the Ice Warrior, allowing the Doctor to divert the Ice Warrior's aim so that Slaar dies.