They set out to track down the Dalek

"Wait a minute!" said the Doctor. "You mean to say that there's an actual Dalek nearby?"

"I guess so," said the woman who called herself Professor River Song. "I don't know that much about them."

At this point, Martha noticed naked Clara rolling her eyes but the Doctor did not notice.

Instead he said, "Well, where is it? We have to go find it."

"I'm not sure," said "River". "Clara and I were both stowaways on the Dalek ship so we were not all that eager to call attention to ourselves. Plus I guess I fell asleep."

"You fell asleep on a Dalek ship?" asked the Doctor.

"Well, it had been a long day," said "River".

Again Martha noticed Clara rolling her eyes but she said nothing.

"Where did the Dalek get off?" asked the Doctor.

"I'm not sure," said "River". "I'm not that familiar with London. But I believe it was a few blocks north of here."

"In that case, we might still have a chance to catch up with it before it can do any harm," said the Doctor. "Can you and Clara come show us where it landed?"

"Certainly, Doctor," said "River".

"Er, aren't we going to take the TARDIS?" asked Clara, still desperately trying to hide her unclad torso.

"No, we'd have a better chance tracking it down on foot," said the Doctor.

"Do we have to?" asked Clara, adjusting her handbra.

"You heard the Doctor," said "River". "Now come along."

But Clara said," Er -- no thanks. I'll just wait here in this basement until you and the Doctor come back."

"Nonsense, Clara," said "River". "You're coming with us and I won't take no for an answer."

"Well, can't you get me some clothes first?" asked Clara.

"Sorry, Clara," said "River", "but we don't have time for all that. We have a Dalek to catch."

"Pleeeease!"

"Really, Clara," said "River". "I don't know what's gotten into you today. You're really quite the impossible girl, you know. Now be a good lass and follow me or else I'll be **** to bring out the leash."

Martha's eyes widened when she heard that last part but when she tried to catch Clara's eye, Clara just shook her head and mouthed the words "long story."

By then, the Doctor had already left and so eventually did "River" and Clara. Martha reluctantly followed despite wondering what she had gotten herself into.