In this episode, Peter messes up the iconic Family Guy intro sequence by accidentally playing the theme song backwards and then doing a bunch of other silly things. This leads to a whole string of alternative realities where things are slightly different, such as Stewie being a baby who can talk but doesn't walk, Brian being a dog who can talk and walk but doesn't have a human mind, and even a reality where the intro is still messed up but Peter is the only one who remembers it!