The Sontarans began to take over the world using Atmos, carbon emission converters to change the atmosphere of the world so they could make it a new cloning planet.

As you noticed all the chaos and the pain being caused by the air that began affecting the people of the world, you thought of your family and of how they might be getting hurt or worried about you at this moment. You had just taken off with the Doctor without saying anything to them. Not even goodbye. You simply left.

As the Doctor began enthusiastically talking about how you’d both fix this situation, you looked at him somberly.

“I’m gonna go home…” you said softly.

This seemed to makes his hearts ache. “Really..?” He looked.. sad.. hurt. “But I was gonna take you so many places… The Medusa Cascade, Barcelona, Malcassairo… all these places…” he looked into your apologetic eyes and sighed “It’s been great with you.. it really has…” he said with a smile. There was still sadness in it, but there was sincerity.

“And let me say, you were brilliant.. you really-“ he looked into your eyes and his face changed to realization “You’re just popping in to check on them and then you’re coming back?”

You nodded

“Ah, got it.” He said, realizing he was being stupid earlier.