Cain decides to abandon his latest invention and donates the prototypes to Isaac's students. Teagan's dad who is an attorney has an idea to save the failed venture.
Isaac and Louann's misunderstandings lead to a communication breakdown. An old acquaintance of Isaac's appears on the scene further complicating matters.
Isaac receives a surprise visit from a vaguely familiar face that ends up shocking him to his very core. When neighbor Tomas finds himself attracted to the new arrival, Isaac attempts to discourage him from pursuing her.
Isaac's pen pal Shelumiel travels half the world and stays with Isaac in order to determine whether or not to move his family to America. Cain has selfish motivations, the kids confuse Shelumiel.
Mayoral candidates Stanley Lipshitz and Russ Asschat hold a mock debate for the kids inspiring them to form their own class government while battle lines are drawn and allegiances decided.
The kids hold elections for class president, Louann decides to become a political activist, Principal Spector asserts his authority while Isaac engages in a power struggle with Poindexter.
Louann's rapidly approaching birthday forces her to reveal a family secret. The kids get a sex education lesson, Cain reveals his newest invention.