Michael Evans is in Montana on a dinosaur dig with his paleontologist father, but he certainly never expected to find a live Tyrannosaurus Rex plucked out of its own time and looking for dinner, nor encounter a girl with some very advanced technology trying to trap the beast.

Having been defeated in Australia and Antarctica, the evil Mr. Bones hides out somewhere he's sure he won't be found: the Moon! But the joke's on him. The young dino tracker Mike Evans and his best friend, Shannon, take to space to face off against their enemy in a lunar showdown of dino-sized proportions! But when they finally track him down, they realize Mr. Bones isn't at all what he seems to be...

Mike Evans and his best friend, Shannon, pursue the dangerous Mr. Bones to Australia, where he has reanimated an Allosaurus and may be seeking more complete dinosaur skeletons to bring to life--but they discover that actually he and his sister have a more profitable scheme in mind.

Mike Evans goes through the time portal to find his friend Shannon and her troublesome brother Jeff, but he soon finds they all have bigger problems--a robot who wants to repopulate the Earth with dinosaurs and a group of Tyrannosaurus rex babies who remember Mike from New York.