As a member of the last Deinocheirus family on Gondwa, Duckling is tired of feeling like a complete outcast. Following a lead that could prove there are more out there, she sets out on a transoceanic adventure to prove she's not alone. At the same time, an old threat reemerges to take down the Guardians of Gondwa once and for all, and Duckling's discovery may be exactly what they need.