Glory McArdle, ex second rate Olympic athlete, ex Phys Ed teacher, is the star of the TV series Vixen the Slayer, when she is co-opted by a trio of aliens to save their world from the recently-awakened Warmother.
Lots of wonderful references to Xena, Buffy, and even Galaxy Quest (it's nice to see a "contemporary" story that admits the existence of the rest of the SFnal culture), as an initially bemused and unprepared Glory finds it in herself to help a beleaguered people. The humour of Glory's situation (including various descriptions of unsuitable armour) is set against the bleak plight of the Belegirans, and the very real possibility that Glory will fail them. All topped and tailed with a fannish summary of the TV series, and an hilarious "episode guide".
