I own nothing of Doctor Who.
BANG!
Launching out of bed in fright, nine-year-old Amelia Pond approached her window cautiously, peeling back the curtains. Eyes widening, she stared at the smoking blue box in wonder, watching as a tall man wearing a brown trench coat clambered over the side and fell to the ground. Certain that he was injured, the girl hurried from the house, kneeling next to the stranger, whose breathing was labored. "A-are you all right, sir? Do you need anything?"
Opening his eyes, he focused them on her, hoisting himself onto his elbows. "I will be once the world stops spinning. Name's the Doctor, by the way. And you..." Trailing off, the man swayed upright, hastily checking his body. "Can't be, not now! Full moon's tonight, yeah?" Glancing up, the Doctor froze as a gap in the cloud cover revealed the white surface of the moon. Scanning the horizon, he noticed a band of clear sky quickly approaching, clusters of stars twinkling. "I've got maybe a minute before the change." Whirling to face Amelia, he spoke rapidly. "Listen to me carefully. Run as far from this place as you can to a neighbor's house, anywhere but here."
"How come?" the girl said in a small voice, scared by the Doctor's tone. Yet before she could ask another question, the moon appeared unobstructed, bathing them both in its light. Trembling, Amelia could only witness the man yell out in pain, collapsing in a heap. Backing away, Amelia covered her ears, unable to tear her gaze off his writhing form while coarse hair engulfed his body. A muzzled snout scented the air, a pair of glowing eyes piercing the night. Yelping, the terrified girl turned and ran, hearing a bone-chilling howl behind her. Reaching the sidewalk, she was about to continue left when a heavy weight slammed into her, pinning her to the ground.
Bending his head, the transformed Doctor sank his fangs in Amelia's shoulder, growling as she screamed. His other half shouted mentally, causing his animal side to waver momentarily. No, I won't let you harm this girl! Gaining control, his sane half broke through, making him leap away, mewling. Forcing himself to reverse the transformation, the Doctor lay panting on the cement, his entire body wreathed in agony. Crawling over to Amelia, he gathered her shivering body in his arms, rocking her. "I'm sorry, I'm so sorry."
Holding onto him for warmth, the girl began crying, her shoulder throbbing. Aware that she had been placed on the soft grass, she looked to see the Doctor standing, averting her eyes upon realizing he was naked. Listening mutely, she started when a loud noise rent the air, a yellow glow coating the dewy grass. Despite her better judgment, Amelia peeked to discover that a different man was crouched beside her, his face much younger. 'What-How are you the Doctor?"
"Extremely long story," he replied, blushing as he noticed he was nude in front of a small girl. "Um, I don't suppose you have any spare clothes I could have, do you?"