Obligatory flashback sequence

Amy Madison silently giggled while she cast a spell upon a naked present Rose Tyler and a well-dressed present Clara Oswald while their backs were turned -- a spell which made the two of them bulletproof. She was just about to tell them about it when her friend Tara Maclay announced, "I found it! I know where they are."

"Where are they?" asked present Clara.

"Inside a ship," said Tara.

"Well, we guessed that," said present Clara.

"No," said Tara. "They're inside a ship located in this area."

"But that's a space map," said present Rose. "They must be inside a space ship."

"Again," said present Clara. "We guessed that."

"Can you land the TARDIS on that location?" asked Tara.

"Just watch me," said present Rose.

"Hey, wait a minute!" exclaimed present Clara. "I thought I was piloting the TARDIS."

"You were piloting it," said Amy. "Now it's Rose's turn."

"But it's my responsibility," said present Clara. "I should do it."

"Oh, shut up and let the girl concentrate," said Amy. "If you keep interfering, I'll see to it that you spend the rest of your life eating cheddar."

"Amy!" cried Tara.

"Tara!" cried Amy.

"Amy!" cried Tara.

"You're right, Tara," said Amy. "I really should apologize. I'm sorry, Tara."

"You're forgiven, Amy," said Tara. "But please don't do it again."

"I don't get what just happened," said present Clara.

"Apparently Amy threatened to turn you into a rat and Tara stopped her," said present Rose.

"What?" asked present Clara.

"Please be quiet, Mistress," said present Rose. "I'm preparing to materialize the TARDIS within that spaceship."

And with that, the TARDIS appeared within the same prison cell that held future Clara and the others.

No sooner had the TARDIS landed than the door opened and Tara and Amy stepped out.

"Get back, Tara!" cried Willow. "There's a bomb over there and it's going to explode."

"Wow!" cried Amy. "That funny cylinder over there is a bomb? Cool!"

"Amy!" cried Tara.

"Oh, right," said Amy. "I don't suppose you or Willow know of a spell that would make me explosionproof?"

"Shouldn't that be 'make us explosionproof'?" asked Willow.

"Oh, right," said Amy, as she looked at the Dalek-shaped bomb. "My bad."