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The obvious answer is the return of the Master because the drumming he heard is four knocks, but David Tennant and Julie Gardner said on the Planet of the Dead commentary is not what we think it is, Julie also said when we figure it out it will break our hearts.
Just as the doctor believes he's safe at the end of 'The End of Time', he hears four knocks. Wilfred Mott, Donna's grandfather, is stuck in a booth that's about to be flooded with lethal radiation. It is he who knocks four times, and the Doctor, being who he has, entered the booth next to it to allow Wilfred to leave. The Doctor receives the fatal dose of radiation, which, after he visits his old companions, causes him to regenerate.
What else can I help you with?
What does it mean when an engine has a tick?
a lot of times its your timing belt, if its more of a knock its could be a rod knock
What does it mean if you sneeze four times?
that you sneezed four times
What does four times its area mean?
its mean to find the area and then multiply by four.
What does the word multiplyby four mean?
it means times by four or to add it 4 times together.
What does knock knock on wood mean?
Knock on wood means you are hoping that it happens.
What does it mean if your period lasts for four weeks?
That it's time to see the doctor!
What does koko mean in botswana?
Entering a House - "Ko ko!" means "Knock knock!"
What does OF mean in a math tense?
Times. Four of fives is four lots of fives of 4 times five which is 20.
What does knock your heads together mean?
knock each other out
What does 4 times daily mean?
That you are supposed to do something four times everyday.
What does knock on the wood mean?
Knock on wood means you are hoping that it happens.
What is a KO mean?
Knock out!
