Halloween crossover. Xander dresses up as the Master Chief from Halo and gets in all sorts of trouble. Xander Faith pairing in later chapters. BTVS, Jurassic Park, Halo & SG1 crossover eventually.
Crossover - Buffy: The Vampire Slayer & Halo - Rated: T - English - Adventure/Sci-Fi - Chapters: 17 - Words: 111,964 - Reviews: 228 - Updated: 8-13-07 - Published: 12-10-05 - Xander H.