Jarrah Clarke, a teenager with a genius for inventing, takes his 10-year-old cousin Tilly and rescued joey Kimberley to witness historical events in the Old Testament. His latest invention (named after Kimberley who accidentally hitches a ride on their first adventure) is the History Hopper. A time travelling device that turns any object it’s attached to into a time machine!
Jarrah is unaware that his time travel is interfering with the forgery operations of an antiquarian criminal mastermind, Aristotle Philetus. At first, Aristotle blames his enslaved thief Pincher until it becomes clear someone else is responsible for the image of a kangaroo appearing on artifacts through the ages.
When Aristotle realizes Jarrah’s invention can assist him in pillaging the treasures of the world, he leaves his secret lair to visit the village of Yongkaup so Pincher can steal the History Hopper. With it, Aristotle plans to build an empire the likes of which the world has never seen before.