He heard giggling echoing from the hallway, while he was piloting the TARDIS console.
Puzzled, he set the TARDIS console to auto pilot for a while and wandered into the hallway.
"Ah! Your hand is cold there!"
"Sorry, is that better?"
"Yeah, thanks Donna"
Stunned, the Doctor stood, intrigued but bewildered in the middle of the TARDIS hallway.
He felt a hand on his shoulder and turned his head slightly to see his clone, sharing the same expression.
Not needing to exchange a conversation to explain their curiosity, the Doctor slowly walked towards a door.
The clone! Doctor followed him silently, running his hand along the walls, silently asking the TARDIS for an answer.
If he wanted an answer, he was obviously not going to get it from her. As if goading them both, the TARDIS opened the door slightly ajar so both could see a crack of light shine through.
The Doctor and clone! Doctor stood closely, both trying to get a glimpse.
"Sarah, put your right leg here on my left leg, and Donna put your right hand on Sarah's right leg."
"But Rose, we'll both fall over if we do that!"
"You won't, you'll be fine, and I'll be holding you both up."
Both Doctor's mouths fell open slightly and attempted to keep straight faces while glancing at each other.
"What the-Hang on! I swear I just saw the tip of jacket just move just then. And the door is ajar!"
Unable to move to hide away, the door opened with two hands grabbing them both by the lapels of their jackets.
Donna and Rose's unmistakable hands yanked them both into the room and shut the door as quickly as possible.
Mickey and Jackie were quietly talking, in a heated discussion which Jack didn't really want to get involved in, knowing Jackie's temper.
Martha was on the phone, lounging about on the jump seat, chatting to who he supposed was her fiancé.
Smiling, he glanced around to find the Doctor who he needed to talk to urgently about Torchwood, knowing he would avoid the subject anyway.
But he was no-where to be seen. No sign of clone! Doctor, Rose, Donna or Sarah.
Frowning, he walked into the hallway.
He found a ray of light peeking out of a doorway and into the hallway. Then heard voices travelling out of the room beyond.
"Okay, Doctor your foot goes there, next to Sarah Jane, and Bluey-"
"I'm not Bluey!"
"Well you haven't got a name and I don't want to be having to say half-human/timelord Doctor all the time. So stop complaining"
"Well you could just call me clone! Doctor?!"
"No, you're Bluey and that's that"
"Now, where was I?! Oh yeah, Rose your hand needs to go over the Doctor's leg and under my arm to be placed on Sarah Jane's foot."
"Okay!"
Giggling now followed this and Jack raised his eyebrows.
Glancing around, Jack now moved closer to the door, resisting the urge to peek.
"Hey! That tickles Sarah!"
"Sorry, I can't help it"
"Ah, that's better Rose."
"Doctor! Get your foot away from my face!"
"I can't! As it is, I'm staring at something I shouldn't be!"
"Oh, grow up, Spaceman, I doubt you mind seeing that!"
At wits end, Jack swallowed his resistance and burst into the room.
"Why wasn't I invited to this sex-" but managed to stop himself short when he found the group of them, all in a tangled mess playing TARDIS Twister. They all looked up but didn't say anything due to their current position.
It was the Doctor who spoke first, poking his head through Donnas' legs.
"Uh...hi Jack. Wanna join?"
Jack only grinned as he took his coat off.