20. Go Fish

Complete story — includes the ending

A member of the school's swim team is found dead. Soon after, Xander hears another member screaming from the cafeteria, and finds his skin along with a fish-like monster. Buffy tails Gage, a third member of the team, fearing that he is the next target. Gage later runs into Angelus, who attacks him. Buffy intervenes, noticing that Angelus spat out Gage's blood rather than drinking it. Xander joins the swim team in order to investigate, learning that the team are being given steroids in the sauna. In the changing rooms, the monster attacks Gage. Buffy again intervenes, before watching Gage turning into an identical monster. Swim Coach Marin and Nurse Greenliegh discuss the crisis, revealing that they worked together to infuse the team with fish DNA. Greenliegh attempts to end the experiment, but Marin pushes her into the sewers, where she is killed by the monsters. Buffy talk with Marin about the experiments, but he tries to make his creatures eat her. She fights off the monsters and Marin ends up getting eaten by them. Giles rounds up Xander and the remaining team members and manages to cure them.