Do I really have to say it again?
The Doctor's brain implodes at Jack's words.
"Who's Jenny?" Rose and her adoptive sibling ask in a single voice.
"Jenny was a generated anomaly created from a sample of the Doctor's skin when we got stuck on a planet called Messaline," Donna offers when the bow tied man continues to mime a statue, "Me an' Martha were both with him that trip. Got dropped into a stupid war bein' fought by clones. Jenny was killed...or so we thought. I bet Martha's fit to be soilin' her trousers by now, seein' her again."
Realization dawns on the blond Time Lady, "So you're sayin' that she's basically another clone of the Doctor's, but with extra DNA tossed in so that she's not a perfect duplicate, right?"
"She's also very dead. I waited hours, but she didn't regenerate," the Doctor scowls and begins throwing levers, "This is probably a trap set by the other River, so no wandering off."
Within minutes, the blue police box materializes inside of the underground complex and the quartet is running for the doors.
When the Doctor suddenly slams to a stop, the others skid into place beside him and together they stare down a grinning woman who stands before them, her thumbs lazily tucked into her belt.
"Hi Dad, I'm home."