The Ascended God Harry Potter sends one of his duplicates to experience Sunnydale again while not remembering anything about it. He also asked one of his wives to go with the duplicate to test something he created. Dawn was happy to volunteer, so she can use the opportunity to fix something back in Sunnydale. Sam and Janet of SG-1 make an appearance. Not a Harry/Dawn pairing.

Reposted: YAHF. After Xander's Halloween costume takes him away from Sunnydale, he returns home with knowledge, training, and experience the likes of which no demon could match. Given who he has become, nothing will ever be the same. No M/M slash, there will be one F/F relationship outside of canon, but nothing graphic. No Lemons or graphic sex scenes. NOT Ship of the Line.

A world-weary Xander Harris returns to Sunnydale Halloween night with a many secrets. Can he help his friends defend the Hellmouth without letting on that he is no longer the boy they knew?

Buffy Summers and Harry Potter are twins that were separated upon the deaths of their parents. To protect them from Voldeomrt they are split till they get their letters for Hogwarts when they are finally reunited at long last.

Five times Harry offers his blood to a vampire and 1 time a vampire offers his blood to him. (Harry/Angel Spike along the way)

In a prom dress and a black leather jacket—toting a crossbow—Buffy goes underground to face the Master. Then a bite and a mucky puddle sends her to elsewhere—where she's found by the boy who made all the wrong choices. Can he be saved or will they run out of time?

After Willow fails to resurrect Buffy, Buffy wakes in 1942 with amnesia. Sent to a London orphanage she meets a mysterious boy & learns the world is at war. Both worlds, the wizarding and the muggle one. Why is Grindelwald's henchman interested in her? What's a Slayer? Why is there a boggart living in her closet? Who are her family? Maybe her new friend Tom Riddle can help her?

The fight between Buffy and her friends against Glory was horrific. Buffy won and the portal was closed. But the damage was done. There were fractures everywhere. Years later Alexander Harris has to clean up one such mess before true evil enters this virgin world.

Harry Potter goes to a support group for those that didn't stay dead. (AU. OOC. Multi-crossover but mainly HP X BVS. Spoilers.)

After a voluntary journey through the Veil of Death, Harry gets pulled to Sunnydale by the power of the Hellmouth. SMUT Lemons

The spirit of Hogwarts feels Harry needs protection. Dumbledore isn't doing a good enough job, so she calls on the only man she feels can get it right. Prophecies fear him, demons flee from him, and Slayers love him. Enter Xander Harris. Fanfic of a fanfic. It's a bit more serious than the original. The original story, Potter's Protector, is written by mjimeyg. On hiatus.

Buffy returns back to Hogwarts to find some things very altered while Cordelia works hard to pull Severus close. However, Severus works to resist her. Will Buffy's godfather find happiness? Read to find out!

Harry and Faith find themselves stuck in purgatory after their close encounters with death, who comes with an offer for them.

In this sequel to "Magical Connections", the Scoobies finally move into their houses and begin their full school year. How will they change and shake up the Harry Potter universe? Picks up where the other story left off and will go through the school year. Major character death in it. Darker than first.

Buffy Summers was born the elder sister of Harry Potter and given up for adoption. Twenty years later while going through Joyce's effects after her death, Buffy finds her adoption papers and taking Dawn along, goes in search of her birth family. Pairings - Buffy/Willow, Dawn/Ginny, Harry/Hermione

Buffy and company are in over their heads with the First and its mind-games. When Xander is used to open the Seal, their universe is invaded by something altogether stranger and more terrifying than Turok-Han: Bella Black and Mira Zabini. They were on holiday and got lost. Bella quickly picks a fight with the First because it's an insult to the Dark to call that thing evil.

With one simple wish to a vengeance demon and Harry gets some of his own back. Response to Scott the Wanderer's challenge, When Harry met Hallie!

Buffy's time as the Slayer starts a little differently.

Winter is in her seventh year of Hogwarts. During the train ride to Hogwarts she gets attacked by a group of bullies and her crush rescues her, causing her to confront the truth about herself while their relationship slowly bosoms.

Being the Slayer on the Hellmouth, dying once already at the hands of the Master – you could say Buffy Summers is fed up with destiny. Just averting another apocalypse by stopping Acathla from bringing hell to Earth through Angel...will the final nail in her coffin be the Wizarding World? A hidden society with actual magic wands, flying brooms, goblins, trolls, and no-nose baddies?

In June 1998, Hermione Granger, brains of the Golden Trio and reputed brightest witch of her age, rejected an offered position with the Dept for Regulation & Control of Magical Creatures and for all intents and purposes dropped off the face of the earth. She has contact with one person during her absence, initiated due to the area of expertise this person has. (More in Chpt 1)

Because of the trauma Harry carries, he is taken out of Britain to the Hellmouth by Severus Snape. They find love and friendship. Comment, floow and favourite for more to come! Harry/Oz Snape/Giles Slow going I guess. First BtVS/HP crossover

Dawn receives yet another set of memories from Tom's reality. This time of a set of movies and the books they are based upon. Can she change the life of Willow's nephew Harry Potter?

After "Purging the Darkness", Cordelia is stuck for a few weeks at Hogwarts, waiting to head back home. Although she is enjoying her time reconnecting with Buffy, Dawn, and Willow, it is a certain moody professor who she is finding most interesting.

It is a repost of Tenhawks story that is on wayback machine. It is BTVS/Harry Potter/Addams family crossover. A step to one side in time, a shift to another in space, and you would be surprised at the changes one might wreak on an unsuspecting world.