Susan Simmons discovers that her teacher is an alien when she sees him peel off his face after class. Susan teams up with Peter, the smartest kid in their class, to halt the alien's plans to abduct the students at the school.
When Emmy discovers that she and her formerly loving parents are being drugged by their evil nanny with rodent potions that can change people in frightening ways, she and some new friends must try everything possible to return things to normal.