DOCTOR

And how does that feel?

DONNA

Brilliant! Fantastic! Molto bene! Great big universe, packed into my brain! You know you could fix that chameleon circuit if you just tried hotbinding the fragment-links and superseding the binary, binary, binary, binary, binary, binary, binary, binary, binary, binary, binary, binary, binary, binary (she takes a deep breath) I'm fine!

The Doctor watches her, sad but not surprised.

DONNA

Nah, never mind Felspoon. Know who I'd like to meet? Charlie Chaplin! I bet he's great, Charlie Chaplin. Shall we do that? Shall we go and see Charlie Chaplin? Shall we? Charlie Chaplin? Charlie Chester, Charlie Brown, no, he's fiction, friction, fiction, fixing, mixing, Rickston, Brixton...

She gasps and leans against the console, holding her head. The Doctor walks to her.

DONNA

Oh, my God!

DOCTOR (quietly)

D'you know what's happening?

DONNA (defiant)

Yeah.

DOCTOR

There's never been a human/Time Lord metacrisis before now. And you know why.

DONNA

Because there can't be.

She turns away, unwilling to accept what's happening.

DONNA

I want to stay.

DOCTOR

Look at me. Donna. Look at me.

She turns back to him.

DONNA (her eyes moist, voice trembling)

I was gonna be with you. Forever.

DOCTOR (gently)

I know.

DONNA (wishful)

Rest of my life. Travelling. In the TARDIS. The DoctorDonna.

He just watches her, his eyes full of compassion and sorrow. Donna suddenly realises what's coming.

DONNA

No! Oh my god... I can't go back. Don't make me go back. Doctor, please, please don't make me go back!

DOCTOR (looking into her eyes)

Donna. Oh, Donna Noble. I am so sorry. But we had the best of times. The best.

She looks at him in despair, tears running down her face.

DOCTOR (whispering)

Goodbye.

DONNA

No, no, no, please!

He places his hands on her temples and closes his eyes.

DONNA

Please, no, no!

Images from their adventures flash backwards, ending with the moment she first appeared in the TARDIS.

DONNA

No!

She falls into his arms, unconscious. The Doctor just stands there, holding her tight, terrible sadness in his eyes.

--

And so the DoctorDonna passes out of this world, out of mortal existence, and out of space... But not out of time! For even as Donna's memories fade, as an inherited Timelord mind fades, as the DoctorDonna fades, she cannot fade from time, for she did exist once and therefore may exist again. Those who are lost, can also be found.

As we exist, we leave pieces of ourselves behind; pieces with those we have touched, pieces with those we have loved, and pieces with those who remember. And in some cases those pieces are more than just a part of us, they are fragments of our very essence. So the question is, who are we that remember?

The Ood remember. The Library remembers. A Doctor with one heart remembers. Three, three remember, and all it takes is three, for a trinity will always be a miracle number. One fragment in a psychic song, one fragment in an electronic database, and one fragment in a mortal creature. The DoctorDonna may be lost, but she is not forgotten. Three fragments remain, a remembered trinity. Those who are lost may be found.

--

A voice speaks from out of the chaos, a warbling mad metallic voice, a voice reaching through the nothingness on the mad chance that a lost woman might just be listening.

CAAN

Awaken my child, and know that for every end, there might also be another beginning. Your time is not done, for Time is not done with you. You are unique within all existence, a Human-Timelord Metacrisis, and there are still many unique tasks left undone. We Daleks were but the first, and far from the last.