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.
Ty has trouble keeping all of the new Trux organized and cooperative, and D-Structs comes up with a plan that throws the crater into even more chaos.
To escape big trouble, the Dinotrux quickly put together a raft and hit the sea. But there might be danger lurking in the water, too.
The Dinotrux return to the crater from their travels to find that D-Structs has taken over and built a huge wall to keep them out.
When the crew is forced to spend a night in the desert to avoid a sandstorm, they wake up the next day without their most important parts.
The Dinotrux investigate when all of the other trux in the crater start running away from a mysterious mountain that may be coming alive.
With the mighty Dreadtrux threatening to destroy the crater, Ty considers working with D-Structs to save both of their homes.