This is one of those episodes which haunts you. A young girl is jogging through the park when she is attacked by a group of teenage boys who rape and then try to kill her.
Doug is undercover as a teacher, while Judy and Tom are students. When the storms cuts the power the same group get out of class and start prowling the corridors chanting and looking for 'a good time'.
When Tom and Judy reveal themselves as police officers Judy almost becomes another victim, but Alison, one of the teenager's girlfriends steps in to get them to look at what they're doing and why.
A truly touching episode that shows how easily a mob can go from fun to dangerous and deadly. Not to mention whoever wrote that chant - it made the episode!