here are the answers to
the clues...
(hm...should I try again, not making as difficult? these weren't deliberately hard, I assure you)
1. She'll guide you in, he'll help you out. Shawn/Devon (4400)
2. Not even the motion of time can keep them apart for long. Dan Vasser/Kate (Journeyman)
3. The tortoise and the mayfly. Methos/Alexa (Highlander)
4. Californian + Northerner = fun. Kate/Lee (Not Going Out)
5. King of weevils, queen of skye...um, er. a clue: part of this line is a typo. Owen Harper/Diane (Torchwood) Pimpmytardis & sunnytyler001 got this.
6. Because "torchwood" is such a lovely name for a girl. Marco Pacella/Toshiko Sato (Torchwood/The 4400) Fififolle got it right.
7. He's hoping to rejoin his wife, and she's offered to be his wife - not that his wife knows. Zeke Stone/Ash (Brimstone)
8. He's very nearly a triune being, but his wife doesn't mind the company any more. Hyde & Tom Jackman/Claire (Jekyll)
9. He turned away a queen for her & she'll never know. Vorenus/Niobe (Rome)
10. She'll eat you alive, which is okay since he's dead anyway. Ancient Mai/Hrothbert (Dresden Files)
11. Is snark kosher, officer? Ziva David/Anthony DiNozzo (NCIS)
12. The communications officer and the multihued rebel leader. hint: this series had two spin-off series & an online sequel. Tim O’Neill/Maria (SeaQuest DSV)
13. He's retired & she's proof that blood isn't the only thing the Irish can get flaming. Fiona Glenanne/Sam Axe (Burn Notice)
14. A protective officer & a native foreigner who thought she could read people. Amanda Price/Bingley (Lost In Austen)
15. Don't look through her, and he won't rip your throat out when that time comes 'round. Annie/George (Being Human)