Danger seems to be following Scott and the gang everywhere. This time, it's not a supernatural being that threatens their lives, but a harmful disease. In a clip for the next episode of "", Lydia's mom, the new science teacher at Beacon Hills High, is the first to find out about the mysterious diseases that strikes the school.
She finds scary rash on the back of lacrosse coach, Coach Feinstock, who has slumped motionlessly on the table. She tells the students to stay in the room and locks the door so that no one outside can enter the building. She calls CDC for help, leading Scott to get suspicious of what is really going on.