The expansions Shrek the Third makes is a medieval high school, as well as the fact that Fiona has a cousin. The first Shrek introduced us to the universe of Shrek, and Shrek 2 introduced us to Far, Far Away, Fiona's parents, Fairy Godmother, Puss in Boots and expands on the magical side of the Shrek universe. Shrek the Third is massively outmatched compared to it's predecessors