After Stewie shot his mother in cold blood on the deck of the cruise ship, Lois returned to Quahog, entering the courtroom just before Peter was sentenced to life in prison.
Stewie escapes the courtroom and along with his hostage Brian, he moves forward with his diabolical plans to take over the world. The only person in the world who can stop him is his mother, Lois.
Peter finds out that his mother gave birth to him in Mexico years ago and because she never got him a U.S. birth certificate, it turns out that he is an illegal immigrant. Peter is let go from his job at the brewery and because of his lack of citizenship, cannot find any work. Lois's father Carter steps in and helps the family, giving Peter a job working on his property. Peter learns the difficulties of being an illegal immigrant living in the United States.
Quahog is experiencing a flash flood, and the Griffins house is filling with water. Before the family can escape, Meg gets trapped in the kitchen, and is found unconscious. She is rushed to the hospital, where Peter vows to never let anything happen to his little girl again. When Meg awakes, she falls for her young intern doctor, Michael, and the two start to date against Peter's wishes.
After growing a moustache and then losing it in a fire at McBurgertown, Peter is given a years worth of hamburgers for free. He eats thirty burgers and in turn, he has a stroke, paralyzing the left half of his body. Meanwhile, Stewie makes a bet with Brian that he can become the most popular kid at Meg's school in a week. Using a few catchphrases to the popular kids, he's in.
When Stewie convinces Brian to go slow with his new girlfriend Carolyn, Cleveland moves in and steals her away; to get her back, Brian does his best to get Cleveland back together with his ex-wife.
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