Unhappy with the in-laws coming over for the holiday, Peter finds the guys are not looking so forward to Thanksgiving at their houses either. When Joe mentions that the prisoners at the Quahog City Jail actually have a nice holiday, they guys commit a minor crime with the intent of joining them. However, due to overcrowding at the city jail, they are redirected to the Rhode Island State Prison.
Because they can't get out until court convenes the following Monday, they try unsuccessfully to lay low. When that doesn't work, they find their only alternative is to join gangs. Cleveland Joe and Quagmire find success but Peter is nearly left out, until he is offered a chance to join a bunch of skinheads. However, he finds it is on the condition that he shivs Cleveland.
Finding that there's no way out of it, he prepares to go through with stabbing Cleveland, but is stabbed first by Quagmire, who is stabbed by Joe and stabbed in turn by Cleveland. To complete the circle, Peter does stab Cleveland but all this nearly starts a riot in the prison. Peter makes an impassioned speech which calms the situation down, and when he wishes he was back home with his family, Lois lets them know that she'll be waiting for him. Peter gets an early release from a prisoner that likely stabbed the warden and everyone gets to go home with their families.
Meanwhile, Stewie, while visiting Peter, tells Brian that he's been romantic pen pals with several prisoners, eventually marrying one.