Shrek and Fiona are reluctantly reigning over Far, Far Away, but they dream about returning to their happy confines of the swamp. Unfortunately, the only way that they are going to see their beloved swamp again is if they are able to find the rightful heir to the throne and return him to Far, Far Away. Shrek, Donkey and Puss in Boots set off to locate the heir while Fiona holds off a coup d'etat being spearheaded by Prince Charming.