A man tries to get into the library to see Giles but is killed by a female demon.
After killing him,she turns into a puddle of green goo. At school, Giles tells Buffy to
meet him later at the hospital for a blood delivery, which attracts vampires. Back at
the library, a detective is waiting for Giles --the dead man had Giles' address on
him. Giles identifies the body as an old friend from London. The body has a tattoo
on it, which Giles says he can't identify. Shaken, Giles doesn't meet Buffy at the
hospital, and she battles the vampires alone until Angel shows up. When Buffy
goes to Giles' house to see what happened, he's disheveled and sends her away.
He calls another friend in London and finds out that she's dead, too. As he rolls up
his sleeves, we see he has the same tattoo as his friend. Meanwhile, the dead
friend, Phillip, comes back to life in the morgue, his eyes flashing, and escapes.
Saturday, Willow, Xander, and Cordelia meet with Jenny Calendar -- Giles' girlfriend
-- for a computer class. Buffy shows up to express her concern about Giles'
behavior. Cordelia mentions the police visit to the library, which slipped her
Cordelia-centered mind. In the library, Buffy finds Ethan, the costume shop owner
and Giles old friend who tried to kill her on Halloween. As she calls Giles, Ethan
mentions the "Mark of Eyghon." Giles says she's in danger, and the dead Phillip
enters. A panicked Giles shows up and, after a scuffle which leaves Jenny
unconscious, Phillip turns into the green goo. Some of it gets on Jenny and when
she comes to, she seems normal but we see her eyes flash. Research freak
Willow discovers the "Mark of Eyghon" in a book: Eyghon possesses the body of a
dead or unconscious host. They figure out that he's jumped from Phillip's body to
Jenny's. Possessed Jenny, looking and sounding like a demon, tries to seduce
Giles. When Buffy comes to the rescue, Jenny jumps out the window. Giles
explains to Buffy that he ran with a bad crowd when he was young, and they used
Eyghon as a temporary high -- directing him in and out of each others' bodies. But
one friend died, then later the girl who killed Phillip, and now it seems the rest of
the group will die, too. Buffy goes to the deserted costume shop to try to help
Ethan but he knocks her out, ties her up and tattoos her. He pours acid on his own
tattoo so that Eyghon will take Buffy instead of him. Jenny enters, a full-tilt demon,
and Buffy breaks free. Angel enters suddenly and chokes Jenny: the spirit leaves
her body and enters Angel's, since he's really dead (Willow's plan: you go, girl!) It
passes through Angel, and Jenny's back to normal,but Ethan escapes.
