"Hello? Is anyone in there? Hello?" called John Watson, standing in front of the blue police box, knocking loudly. Sherlock was crouched at the base, taking pieces of dust and squinting at them, his brow furrowed in concentration. Suddenly, the door opened and Sherlock straightened himself immediately.
"Doctor?" said a female voice from inside the box. "This is London. We're in London. Why are we in London?" She sounded angry, but it also sounded fake somehow – like she was pretending to be mad. A woman with red hair and a slightly cocky look on her face emerged from the box, followed by a tall man in a semi-formal pinstriped brown suit.
"Who are you?" The red haired woman asked a bit rudely, catching sight of Sherlock, who was staring at her intently. ''More bloody deductions' John thought to himself.
"Temp from Chiswick" Sherlock said, looking bored and intrigued at the same time.'
"Of course" John Watson muttered to himself
"How do you know that?" the red haired woman asked indignantly as if she was actually expecting a straight answer from Sherlock. "Doctor, do you know him? Did you tell him about me?" She crossed her arms over her stomach and turned towards the man in the suit. He was watching this little scene with raised eyebrows and an amused expression.
"Donna, this is Sherlock Holmes. Be nice." He said.
"What? No! The Sherlock Holmes? The bloke with the magnifying glass and pipe? RDJ?"
"No, Donna. This is a parallel dimension, one of many – so, not your London. It's the same as your London but… different."
Donna looked confused but said nothing. Sherlock, who had been staring at The Doctor with the same intense expression that he had used on Donna minutes before, looked as confused as his pride would let him "Who – no – what are you?" he inquired.
"Sherlock!" John exclaimed in disbelief
"I'm a Time Lord – the last of my species – from the planet Gallifrey." He started, looking grave. "The box is my TARDIS. It's bigger on the inside and can go anywhere in time and space." He pointed to the blue box. "The TARDIS bought me here on an emergency setting that I've never seen before so whatever's going on here, it got to be big. Really big. The TARDIS didn't do this when Daleks were invading Manhattan so think Earth-turns-into-a-big-pile-of-ash big." He said, looking around hopefully as if he was expecting that anyone had seen or heard anything strange. All he got was one scared face, one bored, and one expressionless (Sherlock's of course).
"He talks a lot" said Donna