Cross Dimension Partners

In the Series 8 finale Missy gets vaporized, but where does she go? To a dimension of magic of course. There she teams up with Bellatrix Lestrange and who knows what two crazy women will get up to. Will Harry and the Doctor be able to stop them? Includes Dimension travel. Takes place after the series 8 finale in doctor who and during Harry Potter and the Deathly Hallows.