Captain Jack Harkness is The Immortal (from TGiQ). These stories chronicle Jack's contact with the Buffy-verse, from how he gets his alias, through dating Buffy, and right up to CoE. Exceedingly canon-compliant.
Captain Jack Harkness is The Immortal. How did he acquire this alias, and how did his and Buffy's relationship develop? Canon compliant in the extreme (including those flashbacks). [No relation to the HP fic of the same name!]
Dr. Who/Torchwood >
Buffy-Centered >
Pairing: Jack Harkness •
elisi • FR13 •
Chapters [17] • Words [83,319] •
Recs [44] •
Reviews [151] • Hits [41,079] • Published [28 Jan 09] • Updated [10 Aug 09] • Completed [Yes]
Or: Capt. Jack pwns Spike & Angel. Concurrently. (Wildly AU crack!fic. Set at the very end of TGiQ.) Spike/Jack/Angel.
Dr. Who/Torchwood >
Angel-Centered •
elisi • FR15 •
Chapters [2] • Words [6,741] •
Recs [1] •
Reviews [8] • Hits [2,118] • Published [21 Sep 09] • Updated [30 Sep 09] • Completed [Yes]
Two *standalone* ‘Fill-in-the-Blank’ stories (one short: NFA, and one long: 'The Year That Never Was') for My Immortal, that tie together major events in the Who- and Buffy-verses.
Dr. Who/Torchwood >
Fred/Illyria-Centered •
elisi • FR15 •
Chapters [3] • Words [12,220] •
Recs [11] •
Reviews [31] • Hits [4,997] • Published [13 Oct 09] • Updated [25 Nov 09] • Completed [Yes]
The Immortal is Captain Jack Harkness. This is what happened next. (Deals with S2 -3 of Torchwood. Canon pairings.)
Dr. Who/Torchwood >
General •
elisi • FR13 •
Chapters [7] • Words [36,077] •
Recs [1] •
Reviews [41] • Hits [7,744] • Published [8 Mar 11] • Updated [8 Jun 12] • Completed [Yes]