On a visit to the Natural History Museum, Chase and Ava seem on the verge of finding out something important about the mysterious Randall, the missing scientist Finn, and the woman who gave them the suitcase filled with magical objects, when the dinosauregg from the suitcase (they thought it was a potato) sends them back to dinosaur times--where they have to return the egg to the correct brontosaurus nest, while eluding hungry dinosaurs, and Randall,...

Ava and Chase want some more information before they embark on another adventure in time, but the woman who gave them the suitcase filled with magical objects is not being helpful, and when Chase picks up the scarab of King Tutankamun they find themselves transported not to ancient Egypt, but to Egypt on the day King Tut's tomb is discovered--and they must get the artefact back into the tomb while avoiding Randall who has arrived before them.