Brian struggles with the realization that he is "just a dog" in the Simpsons' world.
The friendship ends abruptly when it is revealed that Pawtucket Patriot Ale is just Duff Beer with a new label, leading to a massive lawsuit and a physical fight that spans various iconic Springfield locations. Production & Cameos [S13E1] The Simpsons Guy
Stewie becomes obsessed with Bart’s rebellious nature but takes things too far when he tortures Nelson Muntz. Brian struggles with the realization that he is