Synopsis:
When Buffy and the rest of Sunnydale High endure the annual
field trip to the zoo, Xander and some other kids sneak into
the quarantined hyena exhibit, but leave in an altered state.
It's up to Buffy, Giles and Willow to discover the cause behind
Xander's bizarre behavior and reverse the transformation before
it's too late. Meanwhile, Xander's new aggressive demeanor
doesn't play well with his old friends.
Written by: Matt Kiene and Joe Reinmeyer
Directed by: Charles Martin Smith
Original Airdate: April 7, 1997