Dawn was created exactly at 0:00:01 on January 1st, 2000 making her the Spirit of the 3rd Millenium. And on her 19th birthday Fate comes along and sets her on path that will span a thousand years with all the powers that comes with it. So as not live her life alone, she requests that Buffy be allowed to spend it with her.

In the Star Trek universe, the 21st Century was a very tumultuous time. How did the Slayer fare in this era?

Q comes to retrieve, or otherwise finds and wants to return, Dawn the Key. Buffy doesn't take it well.

When a demonic plot in the past changes the future, there's only one Federation timeship that remains unaffected. Alone against an army of starship-sized demons, the ship uses its time machine to retrieve a hero from the past to save the future. The galaxy's one last hope, is Xander Harris. But first, he's going to need some…upgrades.

The powers couldn't deal with the changes to Andrew that were caused by Halloween and Janus so they sent him to a new universe. Warning: Andrew/? slash

Buffy/Star trek/Stargate crossover challenge.

Revised version of the Original A few days after the events of Star Trek: Generations, the USS Corsair finds a distressingly familiar visitor from an alternate universe...

Part 2 of Galactic Wishes - A wish or two is normally harmless... and now for the continuation. Kirk and Spock are still too close to the anomaly, but unfortunately they are called to a private meeting with the Admiralty.

A wish or two is normally harmless, but the crew of the USS Enterprise are shocked by the literal outcome of such wishes, especially in the presence of an unexplained space anomaly that they had yet to figure out or pull away from.

BTVS/ST Xover. Willow gets taken to the future in hopes of stopping a vampire threatening Star Fleet.