Grumon, a wealthy pig, serves as the primary antagonist. He initiates a high-stakes wager challenging Pero to circumnavigate the globe within 80 days. The terms stipulate that Pero's success costs Grumon his entire fortune, while failure binds Pero to permanent servitude. Motivated by protecting his wealth and maintaining control, Grumon actively obstructs Pero's journey through deceitful tactics and deliberate interference. He employs underhanded methods to impede progress, demonstrating consistent treachery and disregard for fairness. Driven by self-interest and a belief that his wealth and status justify manipulation, Grumon embodies antagonistic opposition, creating obstacles that test the protagonists' resolve.