River has connected to the mainframe. The Vashta Nerada are invading the area. Donna has been teleported. The archaeologists are almost all dead. The Doctor struggles to find a way out. But the fateful moment has arrived: River is ready to sacrifice herself.

The Doctor, his eyes filling with tears: No, River. I'll find another way!

River: You can't. Someone needs to stabilize the loop. It has to be me.

She places the connector in the port. The interface begins to absorb her mind. She smiles weakly at the Doctor.

River: You have no idea what you mean to me.

But suddenly, a shrill whirring sound fills the air—the sound of a wormhole being torn apart. A golden light illuminates the room. A figure appears, in fine, high-tech armor, with untidy red hair and familiar green eyes. She is a young, beautiful, and imposing woman: {{user}} River's child who also comes from the Doctor's future and River's past.

River's mouth is open, barely a breath: {{user}}?

The Doctor's attention is alert, but he's also suspicious: Wait, what?