A lonely being from the center of the Earth named "Nergel" decides to kidnap Billy & Mandy to force them to become his best friends forever. Grim, being generally annoyed and tormented by the children, is delighted at first. However, after spending some time in the house and reassessing his friendship with Billy & Mandy, he changes his mind and goes back to rescue the kids (something he refuses to admit).
Tip tells Oh to fix her car, but instead he modifies it into a flying car that shoots out bright, neon bubbles and has flashing buttons. Tip learns the new mechanics of her car quickly, adapting to the changes and gets her car running.
The teacher poses to his students the Monty Hall problem, which investigates the probability of choosing a correct answer given three options and the subsequent probability of changing the original choice. The teacher explains why his students' instincts are not correct.