Don't Forget Your Passport: 50 More Treks Through the Multiverse
"Single fandom lists" was a popular option on the poll, so I thought, well, this is close? And something I could throw together quickly. Quickly and awesomely! Because I heart crossovers.
Warning: these stories contain amnesia, apocalypses, character death, crossovers (duh), deaging, dimension travel, femslash, gen, het, long-lost relations, one night stands, possession, slash, threesomes, time travel, torture, and zombies.
01. Chuck Versus the Mutant Army (gen) [Chuck/Heroes]
02. Five Times The Doctor Travelled With Someone New: Part I: Azkadelia (gen) [Doctor Who/Tin Man]
03. 10-35: Confidential Information (Brendan/Emmett) [Thoughtcrimes/Boa vs. Python]
04. Untitled (gen) [Iron Man/Good Omens]
05. Cosmo & Wanda's New Fairly OddChild (gen) [RPF/The Fairly Oddparents]
06. No More Ugly Naked Guy (gen) [Friends/Queer As Folk]
07. The Decline and Fall Series (Ezra/John) [Tombstone/The Magnificent Seven]
08. A View of the Universe (gen) [Hikaru no Go/Death Note]
09. It's the End of the World As We Know It (Various) [Hostel 2/Grindhouse]
10. Nothing to Write Home About (Various) (Series in Progress) [Alias/The L Word]
11. Rich Man's Darling and Well Baby (Clark/Lex) [Smallville/House]
12. Intern and Love of the Game (Chloe/Charlie) [Smallville/Sports Night]
13. Bert and Ernie (Dan/Casey) [Sports Night/Studio 60]
14. A Distorted Genius (House/Wilson) [House/Nero Wolfe]
15. Inevitable (Various) (WiP) [Harry Potter/Anita Blake]
16. Harsher and Kinder Both (Simon/Ronon) [Firefly/Stargate Atlantis]
17. Ghosts (Tony/Michael) [NCIS/Burn Notice]
18. Stardust (Various) [NCIS/Stargate SG-1]
19. Physics of the Spin (gen) (WiP) [Gilmore Girls/Stargate SG-1]
20. The White Lights and the Blue (Danny/Nicholas) [Hot Fuzz/Torchwood]
21. Quis Custodiet Ipsos Custodies, or, A Humourous Interlude Between Epics (gen) [Stargate Atlantis/Torchwood]
22. Customer Service (John/Ianto) [Supernatural/Torchwood]
23. Defect (gen) [Supernatural/Criminal Minds]
24. Ginjoints (Dean/Slevin) [Supernatural/Lucky Number Slevin]
25. Life and Death in the Cereal Aisle (gen) [Dexter/Supernatural]
26. Darkly Dreaming and Dearly Departed (gen) [Dexter/Hannibal]
27. A Step Out of Time (Various) (Series in Progress) [RPF/Stargate SG-1/Macgyver]
28. Enigmatic Absurdities (gen) [BtVS/House]
29. Five Reasons Xander Harris Hates Pete Wentz (gen) [BtVS/RPF]
30. Perfect Imperfection (Xander/Rose) [Doctor Who/BtVS]
31. Arges and Brontes and sequels (Xander/Rhys) (Series in Progress) [BtVS/Merry Gentry]
32. The Chronicles of Riddick - The Underverse (Xander/Riddick) (WiP) [BtVS/Chronicles of Riddick]
33. Carving Out a Future (gen) (WiP) [BtVS/Firefly]
34. Experience Curve (sequel to Learning Curve) (Spike/Xander, Jim/Blair) [BtVS/The Sentinel]
35. The Doppelgang Effect (Xander/Spike/Logan) [BtVS/X-Men]
36. When at First We Meet (Xander/Dean) [BtVS/Supernatural]
37. Lacking an Anchor (Various) (WiP) [BtVS/DCU]
38. Ordinary Heroes (Various) (Series in Progress) [BtVS/DCU]
39. N. I. M. B. Y. (Spike/Xander) (WiP) [BtVS/Anita Blake]
40. Tears in Our Cheerios (gen) (WiP) [BtVS/Anita Blake]
41. Hyena Pit (Various) (WiP) [BtVS/Anita Blake]
42. Dawning Light (gen) (WiP) [BtVS/Anita Blake]
43. Bodyguard Buffy (gen) (WiP) [BtVS/Stargate SG-1]
44. Scooby Through the Stargate (sequel to A Sarcophagus in Sunnydale) (gen) [BtVS/Stargate SG-1]
45. Chances Are (Xander/Rodney) [BtVS/Stargate Atlantis]
46. Far Beyond Normal (Various) [BtVS/Stargate SG-1]*
47. Father Goose Tales (Various) (Series in Progress) [BtVS/Alias/Other Fandoms]
48. Thirteen Days (Xander/Buffy, Sam/Dawn) [BtVS/Supernatural/Other Fandoms]
49. Prophecies? We Don't Need No Stinking Prophecies (Various) (WiP) [BtVS/Harry Potter/Other Fandoms]
50. Oh, the Places He Goes! (Various) [BtVS/Highlander/Other Fandoms]
*I highly recommend this entire fic, and the beginning of the sequel; for me, it jumped the shark during Buffy's meeting with the President.