The Doctor and Rose walked into the TARDIS; no sooner had Rose shut the door than the TARDIS dematerialised.

"Hey thought you said we were staying?" Rose said angrily at the Doctor.

"I didn't do anything Rose," said the Doctor, rushing over to the console.

"Where we going?" asked Rose going over to him.

"Earth, by the looks of it."

"Where about?" she asked, snaking an arm round his waist.

"No idea, there's no co-ordinates."

"Then who's flying if you're not?" asked Rose, concerned.

The TARDIS hummed.

"Why are you taking us to Earth?" the Doctor asked his old friend.

The TARDIS remained silent.

"What have I done now?" the Doctor asked her.

Still she didn't answer and remained silent.

"It must be bad if you won't tell me where you're taking us," he said.

This time the TARDIS gave an angry hum and violet sparks shot out of the console straight at him. He jumped back, pulling Rose with him.

"What was that for?" he asked.

The TARDIS didn't answer. Instead every light in the console room suddenly started to flash an amber colour.

"Wherever we're heading, it must be urgent; that's the amber alert," said the Doctor.

"I thought mauve alert was urgent," said Rose.

"Amber alert is one down from mauve; mauve means imminent danger."

"Oh yeah, how could I forget," she said, remembering the last mauve alert, when she had met Jack in war-torn London in 1942.

She suddenly had a thought and focused her mind on talking to the TARDIS.

"You're taking us to Jack aren't you?" she asked.

The TARDIS almost purred in response and Rose knew she was right.

"At least she's talking to one of us," said the Doctor.

"Well I haven't done anything to upset her," said Rose as she lovingly stroked the console.

The TARDIS' reaction was the sweetest purr-like sound that Rose had ever heard come from her.

"Hey, what about me old girl?" said the Doctor, gently touching his ship.

Another shower of sparks flew out at him, making him jump back.

"She's really annoyed with you, Theta," said Rose, trying not to laugh at his face.

"All right I give in, what have I done this time?" he asked.

A holographic image of Jack appeared in the console room.

"You're annoyed because I won't talk to Jack. Listen old girl, he was the one who didn't want us anymore."

The image of Jack was replaced with one of Martha, laughing.

"What's Martha got to do with Jack?" he asked, confused.

"Oh my god," said Rose suddenly, tears appearing in her eyes.

"What, what's wrong?" said the Doctor, rushing to her side.

"It's Martha. Jack called about Martha," she sobbed.

"What about her?" he asked.

"She's dying," said Rose as the TARDIS materialised.