Faced by the multicolour Dalek choir, the Doctor backs away, to the TARDIS where the Torchwood team stands waiting. Scratch that, Gwen is waiting. Jack and Ianto have better things to do.

Doctor: "Oh, don't start."

Before Jack can say anything, Ianto replies: "Who said anything about starting? According to my stopwatch…"

The Doctor turns away, looking exasperated. "Both of them?!"

Jack smirks, but doesn't comment.

"So, erm, what do we do about those Daleks out there?" Gwen asks, a little anxious. "We can't wait until they just… disappear, now can we?"

"Of course we can't! But they're not even supposed to be here!"

"Well, according to UNIT measurement…" Martha suddenly appears in the TARDIS. She rolls her eyes when seeing the looks of shock around her. "Perception filter, UNIT developed it. I needed a way to pass those Daleks unnoticed, so I beta tested it."

Seeing that Ianto and Gwen still look confused, she starts explaining: "It's like when you fancy someone and they don't even know you exist."

"Exactly," Jack nods, then winks at Ianto.

The Doctor just looks annoyed. "It's not supposed to work in the TARDIS you know."

Martha shrugs. "I wasn't sure about that either. Anyway, important things first." She tosses something red to Ianto. "UNIT cap. I thought I'd bring you one this time."

A speculative look appears in Jack's eyes, but the Doctor looks more chagrined than ever. "It's supposed to be MY birthday!" Before anyone can stop him, he dashes away, deep into the TARDIS, leaving the others behind.

For a moment, they're stunned. Then Jack gets to his feet and motions Martha to follow him. "I think we'd better persuade him to come back."

Martha nods. "Who would've thought it was his birthday today? I didn't even know Timelords had a birthday! And I thought I knew him so well."

"So did I," Jack says. "But you know, nothing is so good it lasts eternally anyway. And perfect situations must go wrong." He hums a bit, then starts singing.

But this never yet prevented me
Wanting him so much for far too long

Looking back what could I've played differently?
Were there some more clues there, who can tell?
It took so long to understand the man
Only now I feel I know, I know him well

But wasn't it good?

(Martha)
Oh, so good

(Jack)
Wasn't he fine?

(Martha)
Oh, so fine

(Jack)
Isn't it madness

(Together)
He can't be mine

(Jack)
But in the end he needs
A little bit more than me
More security

(Martha)
He needs his TARDIS and his freedom

(Together)
I know him so well

(Martha)
No one in your life is with you constantly
No Timelord is completely on your side
And though I moved the world to be with him
Still the gap between us is too wide

(Martha) // (Jack)
Looking back I could // Looking back I could
have played things // have sung songs
Some other way // so differently
// Learned about the man
// Before we danced
I was just a little //
Careless maybe // But I was
// Ever so much
Now at least // Younger then
I know him well // Now at least

(Together)
I know I know him well

(Martha)
Wasn't it good?

(Jack)
Oh, so good

(Martha)
Wasn't he fine?

(Jack)
Oh, so fine

(Martha)
Isn't it madness

(Together)
He can't be mine

(Jack)
Didn't I know

(Martha)
Didn't I know?

(Jack)
How it would go?

(Together)
If I knew from the start
Why am I falling apart?

He can't be mine

(Jack)
But in the end he needs
A little bit more than me
More security

(Martha)
He needs his TARDIS and his freedom

(Together)
I know him so well

(Martha)
It took time to understand him

(Together)
I know him so well

They both sigh.

"Life with a Timelord can be hard sometimes."

Jack smiles and nods. "On a more positive note I always said you had the voice of a nightingale." He pauses. "You wouldn't happen to have another of those caps, would you?" Then he shakes his head. "Never mind, red really isn't his colour anyway."