The Doctor: Tell you what, here you go...
The Doctor (cont): This universe is in need of defending. Chunk of Tardis. Grow you own.
The Doctor #2: But that takes thousands of years
The Doctor: No, because...
Donna: ... if you shatterfry the plasmic shell and modify the dimensional stabiliser to a foldback harmonic of 36.3 you accelerate growth by a power of 59!
The Doctor/The Doctor #2: We never thought of that!
Donna: I'm just brilliant!
The Doctor: The Doctor. In the TARDIS. With Rose Tyler. Just as it should be.
Rose (to The Doctor): But I didn't think, what about you, are you? You gonna be all right?
The Doctor: Oh, I've got madam
Donna: Human with a Time Lord brain, perfect combination! We can travel the universe forever. Best friends! And equals, just what old skinnyboy needs, an equal!