YAHF reversed, Xander goes from halloween to waking up in the cupboard under the stairs.

Drop a star trek s.c.e. heavy cruiser starship into a stargate universe, add a group of people who think their energy abilities are magic and stir... Harry grows up watching star trek, while an accidentally-made-sentient star ship watches over him. Sorry I'd put Bones up as a character but i'm only allowed two categories in the listing and stargate eventually overpowers.

When the SGC reaches the end of the rope, the only thing left to do is make more rope. Alternate Universe, non-canon characters.