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An eleven year old child, with a scar on his forehead.
"Harry?" he asked, tentatively.
The child didn't answer. He had a weary look, with wisdom beyond his years. He snapped his fingers, and in front of Dumbledore was summoned a bunch of historical knicker-knacks - including the Lost Diadem of Ravenclaw, by the looks of it.
"Oh, my." he said.
"These are all of Voldemort's Horcruxes." said Harry Potter. "I purified them on their way here. The quest is won. Again."
Dumbledore examined the items. "How did you...?"
"Years of training. Thousands of them." answered the child. "They keep sending me back, professor. The first time, I was happy. With a second chance, I could save Cedric Diggory, Fred Weasley. I succeeded, but then it happened again."
"I saved Snape. Went back in time, saved Moaning Myrtle. Heck, I saved Tom. I redeemed him, he was crying and begging forgiveness for his sins. But they keep sending me back. Again and again."
Dumbledore's eyes got misty. He had heard of the horrible fate of some wizards who messed with Time, but this was beyond him.
"Help me, professor." whispered Harry, grabbing his vest. "Please make it stop."