Fics like The Roman and the Immortals

Amy Pond and Rory Williams meet Harry Potter and then Harry Potter and Jack Harkness meet Rory Williams.

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5. Songs of Innocence and Experience by rosa_acicularis (Doctor Who (2005))
6. Time is Out of Joint by jesterlady (Doctor Who, Doctor Who (2005), more)
7. Call Back Yesterday by jesterlady (Doctor Who, Doctor Who (2005))
8. Redeem Those Hours by jesterlady (Doctor Who, Doctor Who (2005), more)
9. And Other Things That Never Happened by tabulaxrasa (Doctor Who, Doctor Who (2005))
10. Three Stages of Truth by JaneScarlett (Doctor Who (2005))
11. Turn Right by DinoDina (Torchwood, Doctor Who (2005))
12. never argue with a 50-foot-robot or a 900-year-old time lord by zombeesknees (Doctor Who, Doctor Who (2005), more)
13. The Meeting Place by Memorykey3 (Harry Potter - J. K. Rowling, Doctor Who (2005), more)
14. Echoes by vigilantexreader (Doctor Who (2005))
15. A Simple Trick by antistar_e (Doctor Who (2005), His Dark Materials - Philip Pullman)
16. The Strange Men and the Blue Box by IHScribe (Doctor Who (2005), Harry Potter - J. K. Rowling)
17. Death and Rory: Pizza, Coke, and the Universe Screwing People Over. by pickwicklingpapers (Doctor Who, Doctor Who (2005), more)
18. Saving Melody by dirgewithoutmusic (Doctor Who, Doctor Who (2005), more)
19. The Good Things (don't always) Soften The Bad Things by timecrayon (Doctor Who (2005), Doctor Who)
20. The Pond Continuum by kaydeefalls (Doctor Who (2005))