An invitation they can't refuse

As present Clara and present Rose watched in horror from the past, the blonde Slayer tried to close the door of Missy's TARDIS, only to find the way blocked by the arm of Darla, a human who supposedly escaped from a Dalek prison camp, only to reveal herself to be a Dalek agent who now wanted to take them all to see some person named Davros.

Normally, the Slayer would have had little trouble closing the door on a mere human. But this human was different. This human seemed stronger than average. Way stronger.

Moreover, the longer the Slayer struggled with the door, the more Darla seemed to be changing the shape of her face until suddenly a Dalek eyestalk burst out of her forehead.

"Oh my God!" cried the Slayer. "It's a robot."

"Not quite," said Darla. "But I might as well be. Now let me in. Resistance is futile."

"Like hell it is," said the Slayer, letting go of the door so that she could give Darla one big shove.

But she might as well have tried to move a bulldozer for all the success that she had.

Then a beam of light shot out of Darla's eyestalk and bathed the entire group in a glowing cloud.

"Third greatest enemy of the Daleks and her companions have been acquired," said Darla.

Then the glowing cloud disappeared and so did the group.

xxx

"Where did they go?" asked present Rose.

"Who knows?" asked present Clara. "Probably to see Davros."

"Well, then we gotta go rescue them," said present Rose.

"We?" asked present Clara. "How can we rescue them?"

"Easy," said present Rose. "We can use our TARDIS."

"But we don't have a TARDIS yet," said present Clara. "And even if we did, we can't cross our own timeline."

"Who says we can't?" asked present Rose.

"The Doctor," said present Clara.

"Well, the Doctor lies," said present Rose. "Besides, you proved it was possible for you to fool the Doctor. Maybe you and I could fool Davros too."

"Yeah, right," said present Clara.

"Please, Clara," said present Rose.

"Oh, okay," said present Clara. "But what about the lady in red?"

"Oh, I'll doubt she'll be doing anything very interesting at this moment," said present Rose. "Besides, she seems to like future me. So future me should be okay until we get a chance to sort out this situation on Skaro."

Present Clara shrugged and turned to the Spirit of Christmas Yet to Come.

"I don't suppose you could guide us to the land of Gallifreyan folk tales and such?" asked present Clara.

The Spirit of Christmas Yet to Come nodded.

"Very well then," said present Clara. "Let's go steal ourselves a TARDIS."

"Okay!" cried present Rose.

"But I'm warning you, Rose," said present Clara. "No getting dressed behind my back."

"But Clara -- oh, all right," said present Rose. "Mine is not to reason why."

"That's the spirit," said present Clara, smiling at the way her words seemed to have produced an all-over blush in present Rose.