Frank and Lara investigate a man who appears to be responsible for a number of ''mercy'' killings.

Mr. Kraft is still dating Hilda, and still boring her half to death. When he announces that he will be chaperoning the Westbridge High ski trip, Sabrina decides that drastic measures are in order: disobeying Zelda's ban on anyone else using her lab top, Sabrina cooks up a potion to make him think like a teen-ager. Unfortunately, Mr. Kraft turns into a particularly obnoxious, irresponsible adolescent, putting both the ski trip and the school into jeopardy.

Sam has been staying with Sunny but is starting to get on his nerves as things don't appear to be going well for Charlie and Baz.