Penelope Rex gets a saber-toothed tiger for her first pet, but find 'Mittens' a lot to handle.

As bloody battle rages between the two surviving dinosaur kingdoms, Eleri and the other young exiles--including a peppy stegosaur, a stoic sauropod, a testy triceratops, and a mysterious spy--have temporarily thwarted the Carrion Kingdom, a conniving cabal of carnivores, and destroyed their secret stronghold. Fearing that their cunning enemies will soon regroup and seek vengeance, the exiles must risk their lives by returning home to unite and lead...