Don't own Doctor Who. This episode takes place after sometime during 2nd series for 10th Doctor and during Dalek for 9th Doctor.
Rose was leaning against one of the control panels in the Tardis control room. She was thinking about her mother back home. Would she be worried about her? Would she trust the Doctor now that he was a different person? Did Rose trust the Doctor now that he was a different person? Ridiculous, Rose thought. Just because he changed his face doesn't mean that he wouldn't keep me safe. He protected me on New Earth, didn't he?
Then how come you got inhabited by Cassandra? A voice kept nagging at the back of Rose's mind. And at Christmas you could have died if you hadn't woken up in time.
That was different. He couldn't help it. He was regenerating.
Would the old Doctor have left you? The voice replied.
No. And the new one won't either. There was something about him that made Rose feel safe. The old Doctor was more reckless, that's what had attracted her to travel with him in the first place. But now… she knew he would protect her.
A button on the panel Rose was leaning on began bleeping. She jumped up just as the Doctor came in.
"What is it?"
"I dunno, it just started beeping."
The Doctor hurried over and flipped a switch. The bleeping stopped, but a readout of a system of planets appeared on one of the screens attached to the panel.
"There's some kind of signal drawing the Tardis off course. It's taking us here."
He pointed to the third planet in the system on the screen.
"That's Earth." Rose recognized it immediately. "We always come here. Something's always drawing us to Earth, or to humans."
The Doctor stared at the screen for a moment, contemplating what his next action should be. Rose often wondered what went on inside his head. He had to make life and death decisions; how did he decide? When it came to the crucial point, how did he know what was best?
The Doctor suddenly turned a wheel on the panel and flipped another switch. The hum of the engines increased in volume, and Rose felt the ship tilt slightly.
"Only one way to find out." The Doctor grinned.
The Tardis materialized in a dark room, dimly lit by lights in the ceiling. The Doctor and Rose stepped out of the Tardis.
"We're underground." The Doctor said immediately.
"Hold on," Rose said. "This looks familiar." But the Doctor's attention was drawn to one of the many glass boxes that filled the room. Each box was set on a pedestal, and seemed to contain some sort of object. But the Doctor's attention was focused on one in particular, which held a silver mask with a large tube running from where the ear would be into the scalp of the head.
"We've been here before." The Doctor said.
"Doctor…" He turned, and saw Rose standing beside a box that held a long, green arm ending in three sharp claws.
An all-too-familiar whooshing sound filled the room. Just metres away, a blue shape began materializing.
The Doctor and Rose hurried towards the Tardis.
"The key! Where's the key!"
"All these stupid pockets, I can't find anything!"
"Hurry!"
But it was too late. They stood by the door of the Tardis, watching in horror as the door of an identical blue police box opened a few metres away.
A figure in a black leather jacket stepped out, followed by a young blond girl.
"So what is it? What's wrong?" The second Rose asked.
"Don't know." The second Doctor replied. "Some kind of signal drawing the Tardis off course."
Miraculously, they hadn't seemed to have noticed their counterparts. If they could just slip in the Tardis and be on their way…
"Where are we?" The second Rose asked.
"Earth. Utah, North…" The second Doctor trailed off as he noticed the identical Tardis and the figures staring at him.
An alarm went off and the main lights came on. Armed guards ran in, pointing their guns at the time travellers.
"Oh bugger." Both the Doctors said.