Full Summary: Everywhere they went, she was known as "the Successor". The problem is, neither she nor the Doctor knew just what it meant. {10/OC}

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((Prologue))

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A man ran his fingers through his styled dark hair, his brown eyes serious as he scanned the screen in the strange room he stood in, lips pursed thoughtfully. "Come on, you," he muttered to the column in the center of the room. "Work. Is there something I'm missing?"

The machine was silent.

The Doctor groaned, rocking back onto his heels. "There's got to be something I'm missing," he mumbled, striding across the control room of the TARDIS to glance outside the double doors. "I shouldn't be missing anything, why am I missing something?"

The TARDIS gave a groan, and then the screen flashed. The Doctor raced back over, examining the screen again. "I knew I wasn't missing anything!" he cried, giving the console an affectionate look. Then his gaze became serious as the TARDIS became quiet. "What's wrong old girl?" he muttered, running his fingertips along the controls. The TARDIS remained still instead of shuddering as it should have, acknowledging his touch.

The Doctor's brow furrowed and he slid on a pair of black glasses, combing his hair again with his fingers. "If I'm not missing something, then why isn't this working?" he said in frustration, glaring at the contraption he'd almost been forced to abandon. "Why isn't anything working?! Can't change my screwdriver…worthless you are," he scolded the TARDIS.

The TARDIS didn't respond.

Screams came from outside and the Doctor gave an anxious glance towards the doors. The TARDIS gave a whining hiss, smoke leaking from the grated floor. "I'm sorry, I'll take a look at the engines later, and right now people are dying."

Without another word, the Doctor snatched up his contraption, grabbed his jacket, and ran out the doors of the TARDIS, locking them behind him.

The TARDIS's lights flickered, and the ship fell silent.

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A/N: My second, hopefully successful attempt at a Doctor Who fanfiction, having to do with my OC and the Doctor! Please review on your thoughts! ^_^