Peter is convinced that a restaurant placemat is a treasure map. Word quickly spreads about the alleged cache, sparking a city-wide search and turning the citizens of Quahog against each other.

After a vestigial twin grows out of Peter's neck, which he names Chip, he eventually starts realizing that people like Chip more than they like him, so Peter has him amputated. However, after Peter gets into trouble, he realizes he needs Chip more than ever.

Quagmire dates a woman named Sonja, who is just as sexually active as he is, but things take a turn for the worse when she kidnaps him to be her sex slave, so Peter, Joe and Ida must search the seedy back alleys of Quahog to rescue him. In the meantime, Brian, Stewie and Rupert get involved in a most unusual love triangle.

The Griffins go to Italy and are faced with annoying immigration laws after Peter destroys their passports.

Stewie and Brian travel back in time to 17th-century Jamestown and make too many close calls with changing history. Stewie decides to destroy his time machine, but comes to regret it when Brian dies after being hit by a car. Devastated by his death, the Griffin family goes out and adopts another dog from the pet store, Vinnie, who is quickly accepted by all the members of the Griffin family, other than Stewie, who can't get over the loss of Brian.

When Peter and Quagmire discover that their singing voices create beautiful harmony together, they form a singing/songwriting team, in the vein of Simon and Garfunkel. However, tensions run high when fame gets to Peter’s head.

When Carter Pewterschmidt cancels the annual Quahog Christmas carnival, because he hates the holiday, Peter must transform his father-in-law from a Scrooge into a hometown hero in order to salvage the event. Meanwhile, Stewie devises a master plan to get the one and only thing he wants for Christmas.

When Peter gets fired for crashing a forklift into a business meeting, Lois takes a job at the grocery store while Peter becomes a stay-at-home dad — which leads to poor bedroom performance.

From Grimm to Griffin, three classic fairy tales get a new Quahog spin, including "Jack and the Beanstalk," "Little Red Riding Hood" and "Cinderella."

Brian tries to use Dylan's television connections to further his career.

When Peter's mother dies, he befriends her longtime pal Evelyn, who tries to seduce him. In the meantime, Stewie feels despair upon dealing with the realities of death.

Peter takes up smoking cigarettes, and is approached by Mr. Stone, an advertising executive who wants Peter to be the face of his anti-smoking campaign under the caveat that Peter continues to smoke. Meanwhile, Stewie helps Chris battle bullies at school.

Chris becomes the heir to Carter's fortune but refuses to accept the money; Peter desperately tries to keep the wealth in the family.

When Peter takes Stewie to the park for some quality father-son time, he mistakenly takes the wrong baby home, prompting Lois to call him an idiot. Determined to prove to her that he's a responsible adult, Peter goes on a business trip to Chicago and returns as an intelligent, classy person.

Chris is forbidden to see Jerome's daughter Pam, so when the kids run away together, Jerome and Peter must work together to find them.

Brian gives Stewie an STD. Meanwhile, Peter and the guys fight back when another group claims their booth at The Drunken Clam.

Meg has fun partying with Peter when he takes her to a college for an interview. Brian must learn how to live in the wild when he gets sprayed by a skunk and is prohibited from entering the house.

When Peter and Chris interrupt Stewie’s TV time, the angry baby goes back in time to break up Peter and Lois so he’s never conceived, but is shocked when he is reborn into a “Downton Abbey”-esque British household.

Cleveland returns to town, but is instantly banned from spending time with Peter when Lois and Donna get into a big fight over parenting.

Peter and Lois decide to open a cookie store, but Peter ruins things when he decides to bring clients in his own way.

Brian's cosmetic surgery leads him down a new career path as a real estate agent, which gets him into trouble with Quagmire.

In a special hour-long crossover with The Simpsons, the Griffins meet the Simpson family when they end up in Springfield after their car is stolen. Stewie takes lessons in pranks and skateboarding from Bart, while Lisa discovers - to her annoyance - that Meg is as good at playing the saxophone as she is. Peter bonds with Homer as they locate the missing car, but then they fight after Peter loses his job when Pawtucket Patriot is revealed to be a copy of Duff Beer.