Phil wants to impress his mom, so Pan, King of the Satyrs and Phil's brother, offers him to be a king for a day. However, Pan actually just wants to avoid the divine retribution of Nemesis, who sees claims of being a king as hubris.
Hercules and Phil head off to visit Phil's mother, where he is asked to take over for the King of the Satyrs, Pan. However, Phil has to contend with Nemesis, the Demi-goddess of revenge, sent to punish Pan for his lack of humility and tribute.