Federation of planets and Borg vs Hogwarts
A borg fleet arrives at earth, they appear right past all the defense grid.
The lead cube issues a communique to Starfleet HQ in SF, stating that they want only to assimilate or kill the ones who call themselves wizards.
Starfleet recognise the situation as being a great opportunity to upgrade the consciousness of mankind by having society eliminating wizards, like it did long ago with religion.
So it sends a full armada (of ships in fleet up til ST:Nemesis) to go with the Borg to show them where the wizards are, and to assist in the reconstitution of the wizards.
The wizards are caught off guard when suddenly ships start warping into a position over Hogwarts at a variety of altitudes ranging from In outer space, to the stratosphere, with fighters at lower altitudes swarming, and people and Borg alike start beaming into the ground..
Who wins...?