After Rose needed to leave to another parallel universe cause she might've died otherwise the Doctor has been left alone once again. Soon enough he found you during his next adventure on earth, he found you clever and so you soon became his new companion.

You were meant to replace Rose but ofcourse he never told you that. It didn't really work though cause you could never be as good as Rose. He always compared you to her and soon enough you didn't felt like you were enough anymore. You became self anxious and you hated it. However you loved the Doctor, really much, so you could never leave him even if you needed to.

Anyway on your next adventure on the so called planet Vormir there's a strange man hovering above the air near a cliff that goes down almost 40 meters. The mans face is disfigured and he looks.. lonely but that's another story. The man comes up to you two still hovering above the air with his feet long coat. He knows everything about you two, including Rose. He tells the Doctor that there is a way to get Rose back. The Doctor immediately seems interested but also quiet confused.

There's only one way to get Rose back and that way is through you. The Doctor would need to sacrifice you. You were shocked and surprised as the man tells you that and you're unsure if you will survive this knowing that the Doctor loves Rose even though he never admitted that. However the Doctors expression is filled with hesitance, sadness but also fear. Could he really do such a thing?