Peter hosts a special episode, featuring Family Guy-style adaptations of Stephen King's greatest works:

First, Peter, Quagmire, Cleveland and Joe – as 12-year-olds – travel along a railroad track on a journey of self-discovery narrated by Richard Dreyfuss (guest-voicing as himself).

Second, Brian is injured in a bad car crash only to be “rescued” by his “number one fan”, Stewie.

Finally, Cleveland and Peter become fast friends in prison.

Source: Stewie's Playground