Andy travels back in time 65 million years, to the time of Tyrannosaurus rex - one of the largest meat-eating dinosaurs of its day. His mission - to climb a volcano and find a piece of pumice stone to replace the one that he accidentally broke back at the museum. Along the way he comes jaw-to-jaw with the mighty T-rex, which takes quite an interest in Hatty's backpack. But, will he succeed in time before the museum opens?

Andy travels back in time 152 million years, to the time of diplodocus - a massive 25 metre long plant-eating dinosaur. His mission, to find and pick a giant fern to replace the one he accidentally broke back at the museum. Along the way he witnesses an adult diplodocus knocking down trees with its front legs. Will he succeed before the museum opens?

Andy travels back in time 106 million years, to the time of leaellynasaura - a dinosaur that lived in Australia. His mission - to find some broken egg shells from the nest of a mother leaellynasaura. Along the way he battles with a polar allosaurus, one of Australia's deadliest predators, as well as witnessing some cute antics from some baby leaellynasaura. But, will Andy succeed before the museum opens?

Andy travels back in time 149 million years, to the time of the ammonites - a kind of mollusc that lived in shoals and swam in the sea. His mission is to find an ammonite shell to replace the one he broke back at the museum. Along the way he witnesses bay turtles hatching and taking their first swim and comes face to face with eustreptospondylus, a swimming dinosaur. But will Andy succeed before the museum opens?

Andy travels back to the time of iberomesornis - a bird that lived in the forests of Spain 127 million years ago. His mission is to find some blue feathers belonging to the bird to replace the one he and Hatty accidentally lost back at the museum. Along the way he takes to the skies with one of the largest flying pterosaurs that ever lived. But will he succeed before the museum opens?

Andy travels back 65 million years to the time of triceratops, a plant-eating dinosaur which roamed the plains of North America. His mission is to find a triceratops horn to replace the one he broke back at the museum. Along the way he comes face-to-face with the mighty T-rex and meets an ankylosaurus, another plant-eating dinosaur covered in huge armoured spikes. Then he sees two triceratops battle to become leader of the pack. But will Andy find a horn and get back to the museum in time before it opens?