Rich Man, Poor Man (1976)

S9E7 Road to the North Pole

Stewie absolutely loves Christmas, second only to his beloved teddy bear, Rupert. When he learns that Santa will be at the mall, he persuades Brian to take him so he can share his Christmas wishes directly with Santa. Reluctantly, Brian agrees, but their trip takes a turn when Santa dismisses Stewie. Upset by the encounter, Stewie and Brian decide to head to the North Pole to confront Santa and remind him of the true spirit of the holiday season.