As a dark army of asteroid rock-ships hurtle towards Earth, a hijacked Aero-cop car crashes in Madagascar, and a Tyrannosaurus Rex claws its way free from the wreckage. Tyrann has come to Earth in a desperate attempt to find his son Tarrock, who is searching for the Grandidierite that will take him home. Will Tyrann reach Tarrock in time before his arch-enemy the evil Terra strikes?

Rex is also under attack. Lord Gorgo has allied with the demonic Mantoids to conquer Earth, and they have recognized the danger Rex presents to their plans. Attacked from within, Rex will need all the support of his friends if he is to withstand the assaults of dark matter on his computer brain.

But Rion is hiding a secret that will challenge everything Rex believes is true. Will Rion’s shocking confession aid or destroy the young hero’s fragile psyche?