When Pac and friends keep defeating all his ghosts, Betrayus, with the help of the demented Dr. Buttocks, decides to clone an army of Netherworld monsters. Lucky for Pac, one little monster isn't really a monster at heart.

Dr. Buttocks amps up the stakes by inventing the Molecular Magnifier to create gigantic Monsters. Meanwhile, Pac is in for more trouble than he bargained for when he adopts the little monster that saved his life.

It's ValenPac Day and Pinky is so jealous of Pac's friendship with Cyli she tries to get rid of her rival, which winds up getting Pac captured by the Pacinator.

Every 100 Halloweens, the two moons of PacWorld turn blue, so Betrayus summons the sinister Count Pacula to drain the last Yellow Orb in PacWorld.

Dr. Buttocks' latest shenanigans wind up defrosting a prehistoric Cave-Kid, who is soon pursued by scientists bent on locking him away - including Dr. B - so Pac and his pals are finally forced to risk it all and travel back in time to return him to prehistoric PacWorld.

As the holidays approach, Pac gets a surprise visit from his parents who are on a "top-secret mission" that compels him to hide them from even his closest friends, who become increasingly suspicious something is very wrong - and they may be very right.

Pac-World's election is coming up and Betrayus uses Obtuse as a puppet candidate. He rigs the election and wins, hoping to find the Tree of Life and the Repository. Meanwhile, Cylindria and Skeebo begin to run for class president, with comedic results.