The Hallowed Travellers

for the wise man looks into space and he knows there is no limited dimension

There's a signal dragging the TARDIS off-course and the Doctor is in trouble. He should be fixing the past but he's diving so far and crashes through the uncrashable barrier. Meeting companions thought to be far safer than they are, River Song shows them the extent of the matter in this new world to explore.

The Doctor must help to save Hogwarts from the influence of Voldemort. Harry Potter is gone and all that can help him is the new three saviors of the school - Neville, Luna and Ginny. With only a copy of the Deathly Hallows and a new wand to help him, can the Doctor change fiction and can the Doctor figure out which universe is real and which is not?

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A Doctor Who/Harry Potter crossover.