"What's My Line" is a two-episode story arc in season two of the television series Buffy the Vampire Slayer.
In part one, Buffy endures Career Week at school while Spike hires assassins to kill her; a fierce fighter who identifies herself as "Kendra the Vampire Slayer" shows up in Sunnydale.
Back at school, Willow is taken into a secluded lounge area to be recruited by a leading software company, along with Oz, the young man who has been watching her for weeks.
A young Caribbean woman sneaks out of an airplane's cargo hold and begins to search Sunnydale for vampires and for Giles.
Giles tells Buffy, Xander, and Willow about the "du Lac Cross" which can be used as the key, and he enlists their help with further research.
Angel, recognizing the assassin's ring as the symbol of the Order of Taraka, warns Buffy that she should leave Sunnydale and hide.
They learn that Kendra was called when Buffy temporarily died in her fight with The Master in "Prophecy Girl".
Spike takes Angel back to the warehouse, where he will be held until he can be sacrificed to restore Drusilla to full strength.
The Scoobies then gather in the library, where Giles announces that Spike intends for Angel to die in the ritual to restore Drusilla.
Angel is tortured by Drusilla, both emotionally and physically; she pours holy water on him as she reminds him of how he killed her whole family.
Xander and Cordelia lure the mealworm assassin underneath a door into a liquid glue trap.
Spike starts a fire and rushes to rescue the unconscious Drusilla, hoping that the ritual has had time to cure her.
The two, now friends, say their goodbyes, and Buffy is left with a new outlook on her position as the Slayer, as well as the knowledge that she is no longer alone in her calling.
Vox observed that the "dutiful and studious Kendra is an illuminating foil for Buffy and her more anarchic slaying style.
"[1] At school, Willow joins Oz as he is opening a box of animal crackers, and he jokes about how the monkey and hippo regard each other.