When King Harold suddenly croaks, Shrek learns he will have to rule the land of Far, Far Away, unless he can find a suitable heir to the throne. The most-promising candidate is Princess Fiona’s cousin Artie, a teenage slacker in a medieval high-school. Shrek and his trusted companions, Donkey and Puss in Boots, set out to bring Artie back but find their mission is a bigger challenge than they expected.