Me and my dad were talking about how HP7 could end, and this was my theory. It's a doctor who, harry potter, wizard of oz crossover :D R&R please?

The Doctor, The Potter, and Oz.

Harry stared into the cat like eyes in front of him, his wand poised. The face he was staring into twisted into an evil smile, and Harry's stomach churned. Here he was, staring into his nightmares, and it was worse than he ever could have imagined. He had to choose now. Did he risk shouting the curse? The curse that could potentially backfire, and even if it didn't could potentially fail, because he had never used it before?

Before he had time to decide, Voldermort raised his own wand, aimed it towards Harry and screamed,

"AVADA KEDAV…" but he never got any further. Because at that precise moment, a blue box fell from the sky, and landed on Voldermort, squashing him flat. Harry gaped, open mouthed at the scene before him, his surprise mounting as Voldermort's legs curled beneath the box.

And just as Harry thought the situation could get no stranger, the door of the box opened and a young girl, around the age of twenty, stepped out, followed by a man in a long brown coat… Harry froze. That was Barty Crouch Jr.

"Barty Junior?! How… the dementors…" But the girl spoke over him.

"Oh. My. God… DOCTOR! You REALLY need to brush up on your parking. You KILLED SOMEONE." She shrieked. Barty – who for some reason the girl seemed to think of as the Doctor turned away from Harry.

"Ah, right. Well. I'm sure he wasn't a nice person or we never would've landed on him… maybe he never gave to charity…" Harry interrupted.

"You… you just killed Lord Voldermort!! He's the most evil wizard there ever was – most people won't even say his name, and then you, YOU, turn up and land on him, act like you don't know who he is and then have the cheek to go by a different name. BARTY CROUCH."

"Sorry, no idea who Barthy or whatever his name is, is, but I'm the Doctor, this is Rose Tyler, and this is the TARDIS, time and relative dimension in space." He said proudly.

"Fine." Said Harry. "Say I play along. Why d'you need a flying box? Surely that gets spotted by the muggles? Why don't you just use a time turner?"

"A what?!" said the Doctor, while Rose screwed her face up in concentration.

"Doctor. You just killed the most evil wizard of all time. Evil WIZARD?!" The Doctor nodded.

"Apparently so. Anyway, love to stay and chat, but we must be off, lots to see, lots to do – never meant to land here, just got pulled off course. See you l…" Harry cut him off.

"So how do I get back?!" Harry demanded crossly.

"Ever seen the 'Wizard of Oz?'" asked Rose. He nodded.

"Err. Do what Dorothy did." She told him, before jumping back into the box.

With a gentle whoosh, the box disappeared and Harry was left standing alone. So he did what he had been told. He put the shoes on, clicked his heels together, and wished to be home. And when he next opened his eyes, he was in Hogwarts.

Meanwhile, on the TARDIS, the Doctor and Rose stood in a bemused silence.

"Doctor?" Asked Rose eventually.

"Hmm?" he answered.

"What just happened?"

"You know what Rose? I don't know!" and then they both began to laugh, each of them as confused as the other.