A prehistoric world, set in the Mechazoic era,is populated by hybrid dinosaur-construction vehicles called Dinotrux, and by hybrid reptile-tools called Reptools.Two best friends, Ty, a Tyrannosaurus Trux, and Revvit, a Reptool, must team up with other inhabitants of the world to defend their community and their work from an evil Tyrannosaurus Trux, named D-Structs.