 In the four-part Halloween crossover, James Gaddas guest-stars as Carl O'Leary, the headmaster of a failing school.James Pearson plays Adrian Lucas, a pupil who puts acid in the water used in apple bobbing.Jason Maza appears as Kris Burrows, whose girlfriend Emma Blakely (Kate Scott) is burned by the acid, and Red Madrell plays Shania Campbell, Emma's best friend who is also burned.