A strange man is on campus looking for Giles. He is almost there when a lady comes up behind him. He recognizes her. She is dead and her eyes are glowing. He starts pounding on the library door, but Giles can't hear because Buffy is doing step arobics to some techno music. Outside, the dead woman kills the man and then turns into slime. The slime touches his dead body and the demon enters him.
The next day, the gang is speculating about what Giles was like as a high schooler. They assume that he was school obsessed and such. Giles approaches them and they meet up with Miss Calendar. They walk off and make a date for Saturday. Giles goes to the library and a police woman tells him that someone was found dead on campus. He goes to look at the body and identifies it as his friend from England.
Buffy goes to the blood bank where she was supposed to meet Giles and sees a bunch of vamps raid a blood truck. Angel comes and they fight them off. Buffy is worried about Giles not showing up, so she goes to see him while Angel delivers the blood to the hospital.
She arrives at his apartment and finds him drinking. He tells her to go away and she leaves reluctantly. He tries to call a friend in London and discovers that she has died. He crosses her name off a list of others. The only two names left are his and Ethan's. He goes to wash his face and reveals a tattoo on his left arm.
Meanwhile, at the morgue, the body of the guy from before "wakes" up and escapes.
Buffy goes to school the next day and tells the gang in the computer lab about how weird Giles is being. Cordy finally tells them about Giles and the police and Buffy goes to the library to call him. When she gets there, she sees someone lurking in the stacks. She goes to investigate and Ethan overturns a bookcase on her. She escapes and asks him why he's there. He tells her that he knows Giles.
They call him and Buffy tells him to get to the library stat because Ethan is there. He tells her that she's in danger and then the dead guy bursts in. She fights the dead guy and Ethan tries to get away. But, Cordy stops him. Buffy locks him in the cage. Then, Giles shows.
The dead guys burst of the cage and before they can do anything, he falls to the ground and turns to slime. The slime touches Jenny, who was unconscious on the floor. The demon enters her. Ethan runs off and she demands that Giles tell her what's going on. He tells her to stay out of it. He goes to his place with Jenny. The gang organizes a research thing into the Mark of Ighon (tattoo) .
At Giles's place, Jenny lays the flirting on thick. Meanwhile, at the library Willow figures out the whole thing. The demon has to jump to a dead or unconscious body. They realize that it jumped to Miss. Calendar. At Giles's the demon Jenny disconnects the phone, so when Buffy tries to call she gets no answer and decides to go over there.
When Giles won't get with Jenny, she starts talking about his past and how she's Ighon, not Jenny. She goes full demon and smacks him around. Buffy comes in and starts a beat down. The demon has nowhere to go, so it jumps out he window.
Willow and the gang find out more about Giles and his past. At Giles's, Buffy finally gets the story out of him. When he was 21, he was studying at Oxford, but he dropped out and got into the occult. He and a group, including Ethan, discovered how to call a demon into their body. When one of them died, he gave it up. And, now the demon is back to kill them.
Buffy runs off to Ethan's to stop the demon. When she gets there, they go into the backroom. Then he suddenly turns on her. He ties her up and goes about putting the Mark of Ighon tattoo on her because it acts like a homing beacon.
The gang realizes that in order to stop the demon and not kill Miss Calendar, they have to figure something out. Ethan finishes the tattoo on Buffy and removes the one on him with alcohol. Giles has a vision of Buffy with the tattoo and he rushes to save her.
The demon shows and it comes for her. But, Buffy has worked herself free and jumps up. She fights with the demon. But, Giles bursts in and tells it to take him instead. It goes to kill him, but Angel runs in and attacks the demon. The demon jumps into Angel and fights with the vampire in him. The two internal demons fight and the vampire wins. The demon is killed. Ethan disappears and Giles helps Jenny home.
The next day at school, Buffy is wailing about how she has to get her tattoo removed. They finally realize how hard it is for Giles to be the watcher. He goes to see Jenny and she asks for some space. Rejected, he walks off and talks to Buffy. Basically, she says it's all right, him having a stormy past, and they go back to training.
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