Olivia and her gang of monster friends travel back in time to Egypt to help Mario the Mummy, who is sick with the Nile Fever. Today, Olivia’s school celebrates… an invention contest! All of her friends show up with their crazy creations. But when Mario the Mummy arrives, he’s not feeling very well... He has Nile Fever! To be cured he will have to stare into the eye of the statue of King Ra in the pyramid of Cheops. The problem is the eye... is in the past! Olivia and her friends do not hesitate to jump down Vane's time machine and face the terrible dangers of this mission to help their friend. Maybe their inventions for the school contest can help them...