The Tenth Doctor started frowning to himself.

The Master offers to take the Ninth Doctor's TARDIS back to him and afterwards Lily Meyers wakes up as the five year old with red hair wanting the Master's head. The Master was gone and only Lily Meyers had anything done to her.

The Master made Lily younger and took off with the TARDIS before anyone noticed, nothing else was wrong as far as the Tenth Doctor can tell so he prepared himself to give the Master some lecture about toying with Human DNA and forget the whole thing.

The First Human Empire had been created by Torchwood and Starfleet working together to 'Defend Humanity from the rest of the universe' causing several Human Governments to Declare Independence for themselves to explore the universe on their own.

The Earth Empire allowed them to scout out the universe for themselves while they prepared to deal with the next threat to the Alpha Quadrant on their own.